LR nailed it for the area. For a tourist trap thats actually fun. buy an online tics to save money, for the whole crew for Xelha, go splash in the water all day(fun place to snorkel,esp. for kids and timid swimmers) while saving time for unlimited drinks-Mexican beer & margaritas no limit- then save some room for the HUGE buffet included. You can ride the bus down from most hotels. better to have some fun than waste "that day".
Hire a hooker? I'm too old, but always looked like a great place to score some freebies to me. I suggest going fishing if you have the $$$ & want to get away from your traveling group.