Start with Diamond Head State Monument, ideally with a reserved entry slot around 2:30–3:00 p.m. The summit hike takes about two hours round trip, including time for the crater views; the trail is steep, exposed, and mostly paved or stair-stepped, so bring water, a hat, and shoes with good grip. Entry is about $5 per person, with parking charged separately, and reservations are required for out-of-state visitors. If you’re driving from Waikiki, allow 15–25 minutes depending on traffic; the parking lot fills quickly, so rideshare or an early arrival is often easier.
Afterward, head back toward Waikiki Beach for an easy hour in the water and a first look at the shoreline as the light softens. Use a public beach access near Kalākaua Avenue, and keep valuables out of the car—there are rental lockers and showers around the busier beach areas. From the beach, stroll through International Market Place, where the open-air walkways, banyan tree, gardens, and shops make for a relaxed wander rather than a major shopping stop. It is generally open until about 9 p.m., though individual stores vary.
For dinner, walk to Royal Hawaiian Center, convenient from central Waikiki and usually open into the evening. Its food hall and surrounding restaurants offer everything from casual plates to sit-down Hawaiian and Japanese food; budget roughly $20–40 per person. Leave enough time afterward to reach your reservation at the Waikiki beachfront luau, typically a short walk or quick rideshare from the center. Plan on about three hours for the welcome, dinner, music, and hula. Confirm the exact check-in time and venue instructions when booking—luau seating is commonly assigned, and arriving 30–45 minutes early makes the evening much smoother.
Pick up the rental car early and drive from Waikīkī to Kailua Beach Park via the Pali Highway or H-3—allow roughly 35–50 minutes, with traffic building after 7:00 a.m. Arrive around 7:30–8:00 a.m. for easier parking and a calmer shoreline. Spend about two hours swimming and strolling the long, soft-sand beach toward the Kailua Beach boat ramp; the water is usually gentler in the morning, though always check posted conditions. Parking is free in the public lots and along nearby residential streets where permitted, and beach facilities include restrooms, showers, and picnic tables. Keep valuables out of the car, especially if you move between lots.
From Kailua Beach Park, drive about 20 minutes north to Heʻeia Harbor in Kāneʻohe for your 4–5-hour Kāneʻohe Bay fishing charter. Confirm the marina, check-in time, fuel or gratuity policy, and whether the boat supplies food, drinks, tackle, and motion-sickness medication; bring sunscreen, a hat, a light layer, and a waterproof phone pouch. After returning to shore, continue about 15 minutes north along Kamehameha Highway to Waiahole Poi Factory. It is a casual, counter-service stop—typically open from late morning into the afternoon, but verify hours before leaving the harbor—where plates run about $15–30 per person. Try the kalua pig or laulau with poi, and save room for the warm sweet-lady-of-Waiahole dessert.
Finish with Waikāne Falls, reached by a short drive inland from Waiahole Poi Factory through the lush Waikāne Valley area. Treat this as a scenic waterfall stop rather than a guaranteed hike: access can be restricted, trails may be muddy, and some viewpoints are on private land, so stay on clearly permitted public roads or marked access and never cross barriers. Allow about an hour to enjoy the valley, taro fields, and mountain scenery. If conditions or access are unclear, simply take in the falls from an authorized viewpoint and head back toward Kailua before dusk; the narrow roads are poorly lit, and heavy afternoon rain can make them slippery.
Leave Kailua around 7:00 a.m. and take H-3 toward H-1, then H-2 north to Wahiawā; allow about 1–1¼ hours, longer if weekday traffic is heavy. Start at Dole Plantation, which generally opens around 9:30 a.m. (check the September schedule before leaving). Give yourself roughly two hours for the pineapple garden, optional Pineapple Express train, maze, and a cold Dole Whip. Admission varies by activity, with combination tickets commonly around $20–30; parking is free. From there, it is only about a 10-minute drive to Green World Coffee Farm on Kamehameha Highway. Stop for a locally grown coffee and a relaxed walk through the grounds—budget roughly $10–25 per person, and expect about an hour.
Continue north on Kamehameha Highway to Haleʻiwa Aliʻi Beach Park, about 25–30 minutes from the coffee farm. This is a good place to slow down: bring sandwiches or pick up something casual in Haleʻiwa, then spend around 1½ hours by the water. Sea turtles sometimes rest offshore or near the rocks, but keep well back, avoid touching them, and never block their route to the sea. Parking is limited and fills faster on weekends, so do not leave valuables in the car. After your beach break, drive about 15 minutes north to Kawela Bay Beach Park. Follow the short paths beneath the coastal trees and enjoy the shade and quieter shoreline for another 1½ hours; swim only when conditions look calm, since North Shore surf can change quickly even in September.
Finish with the prearranged visit to Māla ʻAi ʻOpio Plumeria Farm, allowing about an hour in the late afternoon. Confirm access in advance, since this is a small local operation rather than a conventional walk-in attraction. The fragrance is strongest when the flowers are blooming, and a farm visit is best treated as an unhurried final stop rather than a timed tour. Bring water, reef-safe sunscreen, and cash as a backup for small purchases. Afterward, return toward Haleʻiwa for dinner or a sunset wander, keeping the evening flexible; the drive back to Kailua can take 1½–2 hours depending on traffic, so leave before dark if you are tired.
Leave Haleʻiwa around 7:00–7:30 a.m. via H-2 and H-1, allowing roughly 1¼–1½ hours to Ko Olina with weekday traffic. Start at the Ko Olina Lagoons, where the four crescent-shaped coves are calmer than most west-coast beaches and are good for a relaxed swim or shore snorkeling. Lagoon parking is limited and fills faster on weekends, so arrive early; bring reef-safe sunscreen, water shoes, and your own mask if possible. Spend about two hours moving between the coves, but check the ocean before entering—calm water does not guarantee safe conditions.
Walk or drive a few minutes to Paradise Cove Beach for a quieter stretch of sand and a little coastal wandering. The beach is also the setting for an evening luau, so keep clear of any event setup and avoid taking valuables from the car. After roughly 1½ hours, return to the resort area for lunch or a drink at Ko Olina Golf Club. The clubhouse is a pleasant, unhurried stop with views toward the fairways; allow about $25–50 per person, and check the day’s dining hours before relying on it for a full meal.
In the afternoon, drive west along Farrington Highway to Electric Beach in Nānākuli, roughly 15–20 minutes from Ko Olina. This is an experienced-snorkeler location beside the power plant’s warm-water outflow, not a casual swimming beach: enter only if conditions are calm, stay well clear of the outflow pipe and channel, and ask local lifeguards about currents. If there is strong surf, murky water, or a powerful current, skip the water and enjoy the view from shore instead. Return to Ko Olina Beach before sunset for an easy walk along the lagoons; sunset is usually around 6:40 p.m. in September. Parking becomes easier after day visitors leave, but allow extra time to find a space, and check sunset and beach-access conditions locally before heading out.
After arriving on the Big Island, pick up a rental car at Ellison Onizuka Kona International Airport and head south on Queen Kaʻahumanu Highway and Māmalahoa Highway toward Captain Cook. Allow about 45–60 minutes to Kona Coffee Living History Farm; the farm is generally open Tuesday–Saturday during daytime hours, so verify the September 15 schedule before flying. Plan roughly two hours among the coffee orchards, historic buildings, and hands-on demonstrations of traditional Kona farm life. Continue a few minutes south to Greenwell Farms in Kealakekua for its complimentary estate tour and tasting—allow 1½ hours, wear closed-toe shoes, and expect a donation or small retail purchase rather than a major admission fee.
Drive south on Highway 11 to Puʻuhonua o Hōnaunau National Historical Park, about 20 minutes from Greenwell Farms. Spend around two hours walking the coastal grounds, viewing the reconstructed temple platforms and carved kiʻi, and following the shoreline trail; the park typically opens from early morning until late afternoon, with a vehicle entrance fee around $20 per car. Treat the place respectfully—it is a sacred refuge, not simply a scenic ruin. When ocean conditions are calm, continue to nearby Two Step at Hōnaunau Bay for about 1½ hours of snorkeling. The entry is a lava shelf rather than a sandy beach, so bring reef shoes, avoid the exposed rocks when swell is running, and do not enter if waves are surging or the current looks strong.
Backtrack north to The Coffee Shack in Captain Cook for lunch, another coffee, and its famously broad views down the coast; allow about an hour and roughly $15–30 per person. It is a popular stop, so arriving outside the busiest midday window helps, and hours can vary seasonally. Finish at the Kealakekua Bay sunset viewpoint, a short drive north, where you can watch the cliffs and bay turn golden for about 45 minutes. Bring a light layer and check sunset time—around 6:15 p.m. in mid-September—then return to Kailua-Kona on Highway 11, allowing 30–40 minutes depending on traffic.
Start at the Kona Farmers Market in central Kailua-Kona, ideally around 7:00–8:00 a.m. It is usually busiest and best stocked early, with papayas, bananas, pineapple, baked goods, macadamia products, and locally made gifts. Allow about an hour, and carry cash even though some vendors accept cards. Market hours can vary by day and season, so confirm the September schedule before leaving; keep any fruit or food purchases within Hawaiʻi’s agricultural inspection rules if you are flying interisland or off-island.
Walk or drive a few minutes downhill to Kamakahonu Beach, beside the historic royal compound at Kamakahonu National Historic Landmark. This is a pleasant final swim because the small cove is generally calmer than open-coast beaches, though conditions can change and coral or rocks make water shoes useful. Spend roughly an hour on the sand or taking the shoreline path, then change before breakfast. Street parking near the waterfront is limited and often metered; arrive early rather than trying to find a spot later.
Have your final Kona coffee and breakfast at Island Lava Java on Aliʻi Drive, budgeting about $15–30 per person. The oceanfront setting is especially nice in the morning; expect a popular café and a possible wait, so allow an hour and avoid ordering more than you need before a flight. Afterward, stroll to Kailua Pier for a last harbor view and a relaxed 30–45 minutes—this is also a good place to check that luggage, IDs, and rental-car paperwork are organized. If flying from Ellison Onizuka Kona International Airport, return the car and leave Kailua-Kona about two hours before a domestic flight, allowing roughly 20–25 minutes for the drive plus rental-car return and airport screening; add extra time for a checked bag or an early-morning weekend crowd.