Guided tour to the historic underground tunnel network used in the Vietnam War; tours usually depart early and take ~5 hours round-trip including transfers.
My Son is a Cham archaeological complex (open 8:00am–4:30pm) — or choose a gentle bike to Tra Que vegetable village for hands-on farming experience; My Son tours take ~4 hours including transfers.
Full-morning guided trek through rice terraces and Hmong/Red Dao villages — a highlight for cultural and landscape photography; typical trek 4–6 hours depending on route.
Transfer time varies with your flight; allow 45–60 minutes to Noi Bai International Airport from the Old Quarter for evening flights (book private transfer or taxi).