Start with a classic Hanoi breakfast: pho or bun cha in the Old Quarter for a local flavour blast and easy people-watching in the lane-filled neighbourhood.
Catch the Thang Long Water Puppet Theatre show (usually 8:00pm) — a fun cultural performance showcasing Vietnamese folk tales; book tickets in advance.
Explore the Japanese Covered Bridge, assembly halls and old merchant houses (many monuments open 8:00am–5:00pm); purchase a local heritage ticket for entry to several sites.
Guided tour (7:30am–1:00pm typical) to the extensive tunnel network used in the war; includes a guided walk, demonstration areas and optional crawl tunnels.