Taking a well-appointed river boat is an unforgettable way to explore some of Southeast Asia’s most alluring destinations. From July to October this year, Pandaw Cruises ( pandaw.com) is rolling out the red carpet for children embarking on select adventures during school breaks. Guests between the ages of five and 18 can travel for free on any of the following seven-night itineraries: a classic Mekong cruise between Siem Reap and Ho Chi Minh City with a detour to Kratie to see endangered Irrawaddy dolphins; a cruise on Myanmar’s Irrawaddy River between Mandalay and Bagan; and a voyage along the lesser-known Chindwin, also in Myanmar. Traveling kids will bed down in a complimentary second cabin and receive all meals and local drinks for free, along with cultural performances and daily excursions led by expert guides. Also free of charge is the use of mountain bikes for a closer look at the villages, temples, and rural scenery along the route.