Ferry from Battery Park to Liberty Island and Ellis Island — history of immigration and iconic skyline views; first ferries typically run from 8:30 and visitor centre access is usually from 9:00–16:00 (book timed tickets in advance).
Walk across the historic Brooklyn Bridge for skyline views, explore DUMBO and the Brooklyn waterfront; ideal in the morning to avoid the busiest crowds.
Enjoy an early hotel breakfast and prepare for rail travel — Amtrak from NYC Penn Station to Philadelphia 30th Street Station is around 1h25m; trains depart frequently.
Visit Independence Hall (guided tours require timed tickets; buildings generally open from 9:00–17:00) and the adjacent Liberty Bell Center (open 9:00–17:00).
Popular farm-to-table at Founding Farmers (reservations advised) or classic fare at Old Ebbitt Grill close to the White House; both serve midday from ~11:30.
Start with either the National Air and Space Museum or the National Museum of American History (Smithsonian museums typically open 10:00–17:30); visit Lincoln Memorial and Washington Monument exterior.
Quick breakfast at the hotel then transfer to DCA/IAD/BOS/airport depending on flight routing; book morning flights to Buffalo/Niagara Falls Airport for full afternoon arrival.
Experience tunnels behind the falls (Journey Behind the Falls typically open 9:00–17:00) or the Cave of the Winds platform at Goat Island (check seasonal hours).
Take the Whirlpool Aero Car (subject to seasonal hours), a guided nature hike at Niagara Glen (trail hours daylight only), and plan to stay for illumination at night (lighting schedules vary but typically after dusk).
Stroll the Walk of Fame (open 24h) or catch a twilight vista of the city from Griffith Observatory grounds (the Observatory has specific opening hours — check before visiting; grounds open daily).
For a theme-park day, Universal opens ~9:00 and closes between 17:00–20:00 depending on season; Warner Bros. Studio Tour requires a timed booking (tour durations ~2–3 hours).
If time allows, take a short Griffith hike for morning views (observatory grounds open; building hours vary) or pick up souvenirs in Hollywood/West Hollywood.
Head to LAX for your flight home — leave ample time for LA traffic (allow 1–1.5 hours to the airport plus recommended 2 hours for domestic departures/3 hours for international).