My kids are 14 and 17 and we’ve taken them to Hawaii twice, once to Kauai and once to Maui (and Aulani both times, of course). We’re hoping to go next Christmas, and they both agreed they’d like to go back to Kauai. Princeville Ranch has some great adventures, Waimea Canyon, Napali Coast boat tour, and of course great beaches and food. We enjoyed Maui as well, but we like the more laid back feel of Kauai. Really you can’t go wrong with any of the islands!