Stroll around the scenic Hoan Kiem Lake and visit the historic Ngoc Son Temple at its center, open all day and free to enter the lake area, temple has a small fee.
Discover the UNESCO-listed town with historic architecture, lantern-lit streets, markets, and the Japanese Covered Bridge, open all day, museums typically 8am-5pm with small entrance fees.
Take a half-day guided tour to the famous Cu Chi Tunnels, important Vietnam War historical site, tours start around 7am-8am, duration approximately 5 hours including travel.