Drive to Portland via I-95, allowing roughly 3–6 hours depending on your starting point, traffic, and rest stops. Leave early enough to arrive with daylight for a walk; Maine’s highway towns make easy break points, and it is worth stretching rather than pushing straight through. Once in Portland, leave the car at your hotel or use a downtown garage such as Spring Street Parking Garage or Fore Street Garage—downtown street parking can be competitive, and a car is more nuisance than help once you begin exploring on foot.
After checking in, spend about 1½ hours wandering Portland Old Port, where cobbled lanes, red-brick warehouses, small galleries, and working waterfront activity give the district its character. Walk downhill toward the piers, then continue along Commercial Street for harbor views and local shops; allow about an hour here as the evening light softens. Both areas are compact and best explored on foot, though the brick and uneven paving call for comfortable shoes. Shops generally stay open until around 5 or 6 PM, with restaurants and bars running later.
Have dinner at Eventide Oyster Co. in the Old Port, a lively, casual choice for Maine oysters and its distinctive brown-butter lobster roll. Expect approximately $30–$50 per person before drinks; waits are common at peak dinner time, so joining the list early is wise. Afterward, drive or take a rideshare roughly 10 minutes east to the Eastern Promenade. Finish with a relaxed walk along the waterfront paths and lawns overlooking Casco Bay and its islands—one of the best low-effort introductions to Portland, especially around sunset. The promenade is open to the public at all hours, but bring a light layer: the bay breeze can feel cool even in early September.
Start at Willard Beach in South Portland, arriving around 8:00–8:30 AM when parking is easiest and the sand is still quiet. The beach is broad and gently curving, with clear views toward Spring Point and the islands beyond; allow about 1½ hours for a relaxed out-and-back walk. There is usually a small metered parking area near Willard Beach, plus nearby street parking where permitted. Afterward, drive roughly 10 minutes to Bug Light Park, where the short paths around the Portland Breakwater Lighthouse make an easy late-morning stop. The park is free and open from sunrise to sunset, with benches and excellent harbor views; allow about 45 minutes, and bring a layer because the waterfront can feel breezy even on a mild day.
Continue about 15 minutes south to Fort Williams Park in Cape Elizabeth. This is the day’s best place to slow down: follow the coastal paths around the rocky shoreline, explore the old fort ruins, and spend time at Portland Head Light. The park is open year-round from sunrise to sunset; parking is generally paid during the main season, and a few dollars in cash or a card is useful. Give yourself about two hours, including time for photographs and the short walks between overlooks. In early September, the lighthouse grounds can be busy around midday, so the farther coastal paths are a good way to find quieter views.
Drive about 10 minutes farther to Two Lights State Park, arriving in the late afternoon when the angled light is especially good on the headlands. Follow the shoreline paths and pause on the granite ledges to watch the waves; the park typically closes around sunset and charges a modest seasonal day-use fee, so check the posted hours on arrival. Finish with dinner at The Good Table, a relaxed Cape Elizabeth restaurant about 10 minutes away. Expect roughly $25–$45 per person for seafood-focused fare; hours can vary by season, so verify the evening service before leaving Two Lights State Park. This is a good night to keep unhurried—coastal roads are dark after sunset, and the drive back toward Portland is easiest before it gets late.
Begin at Kennebunk Beach around 8:00 AM, while the shoreline is quiet and parking is much easier than later in the day. Walk north or south along the broad Atlantic beach for about 1½ hours; September mornings can be cool, so bring a light layer, and note that beach parking rules and fees vary by lot and may still be enforced after Labor Day. Keep your parking receipt or permit visible, and avoid leaving valuables in the car.
From the beach, drive roughly 10 minutes into Kennebunkport’s Dock Square for a late-morning wander. The galleries, boutiques, and small shops around Ocean Avenue and the Kennebunk River generally open between 10:00 and 11:00 AM, so this is an easy time to browse without rushing. Have coffee or a light snack nearby, then allow about 15 minutes by car to reach Cape Porpoise. This working harbor is best enjoyed slowly: watch the lobster boats, walk along the waterfront, and take in the quieter fishing-village atmosphere. Keep clear of working docks and check restaurant hours before relying on the harbor for lunch, since September schedules can be reduced.
After Cape Porpoise, drive about 15 minutes to Goose Rocks Beach for a 1½-hour walk. Check the tide before setting out—low tide reveals the broadest stretch of sand and better views toward the islands, while a rising tide can make parts of the beach surprisingly narrow. Parking is limited and enforcement is seasonal, so arrive prepared for a short walk from the legal parking area; do not assume roadside spaces are permitted. A warm drink or casual snack in Kennebunkport makes a sensible stop afterward before dinner.
Finish at The White Barn Inn Restaurant in Kennebunk, about 15 minutes from Goose Rocks Beach. Reserve ahead for the polished prix-fixe dining room, allow roughly two hours, and budget about $75–$150 or more per person before drinks and gratuity. The historic barn setting is smart but not overly formal; arrive a little early to enjoy the grounds and keep the evening unhurried.
After breakfast in Kennebunkport, leave around 8:00 AM so you can reach Bar Harbor with time to settle in before the tide-dependent walk. On arrival, leave the car at your hotel or use one of the municipal lots near downtown; street spaces fill quickly, and the waterfront is much easier to explore on foot. Before setting out, check the exact low-tide window for the Bar Island Land Bridge through the National Park Service tide tables. The crossing is only safe during the exposed window, with enough time to return before the water begins coming in. Allow about two hours, including the walk across the sandbar and the trail toward Bar Island; wear shoes that can handle wet, uneven sand and do not linger beyond the marked safe period.
Return to town and have a casual lunch along Main Street before following the Shore Path from the waterfront. This easy, mostly level stroll takes about an hour and is best enjoyed slowly, with stops to watch boats in the harbor and look across Frenchman Bay toward the islands. The path can be busy near the downtown end, but it thins out as you continue; keep to the shoreline side where possible and be respectful of the private properties bordering parts of the route.
Finish the waterfront portion of the day at Agamont Park, where the broad lawn makes a pleasant place to sit with harbor views, especially as the light softens in the evening. From there, drive roughly 10–15 minutes, depending on traffic and the food truck’s current location, to The Travelin’ Lobster for a relaxed Maine lobster dinner. Expect approximately $25–$45 per person; hours and location can vary seasonally, so check its social media or current listing before leaving Bar Harbor, and bring a layer for outdoor seating. After dinner, return to town for a final short wander along Main Street, or head back to your accommodation for an early night.
Leave Bar Harbor around 5:30–6:00 AM for Cadillac Mountain, allowing roughly 20–30 minutes via Eagle Lake Road and Park Loop Road. A vehicle reservation is required for the summit during the 2026 season, in addition to the Acadia National Park entrance pass; check the official reservation system for the exact September 6 availability and entry window. Arrive with warm layers, water, and a flashlight if you are aiming for sunrise—the summit is exposed and noticeably colder than town. Allow about 1½ hours for the viewpoints and short summit paths, then continue downhill toward Sand Beach; parking is limited, so an early start is a real advantage.
Spend about an hour at Sand Beach, where the small crescent of sand sits between granite headlands and spruce forest. The water is cold even in September, but it is a beautiful place for a short shoreline walk and photographs before crowds build. From the beach parking area, follow Ocean Path south along the coast for roughly 1½ hours, stopping at the rocky overlooks and Thunder Hole. The route is mostly easy but uneven in places; sturdy shoes are better than sandals, and waves can surge unexpectedly around the rocks. If you drove rather than used the Island Explorer shuttle, expect to move the car only when necessary—parking along this section fills quickly, and the shuttle is useful when operating.
After the coast, drive approximately 15–20 minutes inland to Jordan Pond. Have a picnic or a casual packed lunch before walking part of the pond loop; the full circuit takes about two hours and includes roots, rocks, and a few narrow boardwalk sections, so turn back whenever the pace feels right. The views toward The Bubbles are especially good from the southern and western sides of the pond. Finish at Jordan Pond House, the park’s classic stop for tea and popovers. Plan on roughly $25–$50 per person, and expect a wait at peak lunch and late-afternoon times; service is seasonal, so confirm September hours before setting out. From there, return to Bar Harbor in about 25 minutes, leaving time for an unhurried downtown stroll or an early dinner rather than adding another major sight.
Leave Bar Harbor around 7:00 AM after breakfast, following US-1A and I-395 toward the Penobscot River before joining I-95 south. The direct drive to Penobscot Narrows Bridge & Observatory takes about 1½ hours, though the full return to Portland is a long day, so fill up before leaving and pack coffee and water. The observatory is accessed from the Fort Knox State Historic Site side in Prospect; allow about an hour for the bridge views and river scenery, and check the seasonal opening schedule before departure, as access can be limited in early September. Admission is typically modest, with separate or combined fees possible for the fort and observatory.
Continue south toward Bath, allowing roughly 1¼–1½ hours from Penobscot Narrows. Spend about two hours at the Maine Maritime Museum, whose waterfront campus covers Maine’s shipbuilding, fishing, and seafaring history; the historic boats and river-facing exhibits are the highlights. It generally opens in the morning and closes in the late afternoon, but verify the day’s hours before setting out. For a quick bite, use the museum café if operating, or grab something in downtown Bath—it is only a few minutes away by car—before the next stop.
From Bath, drive about 25–30 minutes to Fort Popham State Historic Site in Phippsburg. Give yourself an hour to walk through the unusual granite fort, look out over the meeting of the Kennebec River and Morse River, and stroll briefly along the nearby beach. The grounds are especially pleasant in the afternoon, but bring a light jacket: this exposed point can feel breezy even on a mild September day. Check the seasonal gate and building hours; if the interior is closed, the exterior grounds and shoreline are still worthwhile, usually with a small day-use or parking fee.
Allow about 1¼–1½ hours to drive from Fort Popham to Portland, depending on traffic around Brunswick and the I-295 interchange. Park once in the Old Port—a garage is easier than searching for street parking—and walk to Duckfat for the trip’s final meal. Expect Belgian-style fries, sandwiches, and rich comfort food at roughly $20–$35 per person; the restaurant is popular, so an early dinner around 5:00 PM is the least stressful choice. Afterward, leave room for an unhurried stroll along the cobbled streets and working waterfront before checking in or beginning the next leg of your journey.