Try to book hotels or resorts with pools for the kids.
Water puppets on display in Hanoi.
Vietnamese boy in the rice fields.
Cycle the Mekong Delta in South Vietnam - roads are flat & quiet and your travel with a support vehicle.
Kayak Halong Bay in North Vietnam.
Crawl through the Cu Chi Tunnels, a day trip from Saigon.
Hanoi's Water Puppet Performance - "Punch & Judy in water" - lots of fun.