Go visit the Cu Chi Tunnels, which are 70 kilometers North West of Ho Chi Minh City, created since 1948 to assist the Viet Minh to combat the French. This is an underground city with living areas, kitchens, storage, weapon shops, field hospitals, command centers.
In the morning, enjoy more cruises through the Bay and have brunch before disembarking at Bai Chay. Cars pick up and bring you back to Hanoi for overnight. Overnight in Hanoi.
Free time for shopping or optional visit before transfer to Noi Bai airport for departure.