A little preliminary travel research on Riviera Maya might have you thinking that the region offers mostly adult-only resorts for couples and partiers. But there are plenty of hotels that meet the needs of families, too, with sand-castle contests, treasure hunts, free non-motorized water sports, and more. Check out our 11 kid-friendly hotel picks in Playa del Carmen, Puerto Morelos, Tulum, Akumal, and Puerto Aventuras in Mexico's Yucatan Peninsula.