Cancun is famous for its party scene. If you want to get to know this side of the city while out at sea, this adults-only cruise is just the thing you're looking for. You'll cast off from Cancun's harbour and sail along Mexico's Caribbean Coast. The crew will drop anchor for an hour in a secluded spot so you can go for a dip and try snorkelling. Onboard, they'll host games and competitions, too. What's more, the catamaran has a DJ and an open bar – cocktails and dancing, anyone?