Important modern-history museums and landmarks that explain the Vietnam War era and reunification — War Remnants Museum typically open 07:30–17:30 and Reunification Palace 07:30–16:00.
Early hotel breakfast then board a guided Mekong Delta day trip to My Tho or Cai Be; most full-day tours depart 7:00–8:00 and return by late afternoon.
Cruise along the Mekong’s canals, visit coconut candy workshops and fruit orchards — typical tour includes a small boat and walking on islands; activities run throughout the day.
Wander the lantern-lit streets, visit the Japanese Covered Bridge and small museums; Ancient Town entry tickets cover several sites and are valid all day (ticket roughly VND120000).
My Son is a Cham temple complex about 1–1.5 hours from Hoi An; tours typically depart 8:00–9:00 and return midday. Alternatively, a guided bike ride through rice fields offers a relaxed local experience.
If you prefer history, book an afternoon Cu Chi half-day tour (tours run through late afternoon and depart early). Alternatively, stay local for the Jade Emperor Pagoda and shopping at Saigon Square (pagoda open daily, squares open ~9:00–21:00).
Complete check-in and immigration; international counters typically close 60–45 minutes before departure — book an evening flight to match your original 20:15 expectation.