"What's a mermaid show? Like, she has a tail — and she's underwater?" your friends from a boring state far away where the sun isn't always shining will ask, a bit skeptical of your plan. At this point, you'll have some explaining to do on your way to Wreck Bar, the shipwreck-style dark wooden bar with wide windows looking into the Sheraton's pool. Before the half-hour show begins, you can see, from the neck down, not-so-fit patrons bobbing along, an impromptu warm-up of humor. Soon they will be replaced by svelte, tailed women. The mermaids, with long hair and angelic underwater choreography, peek through the panoramic rope-framed windows. They move like belly-dancing flounders and flirt with patrons they undoubtedly can't see with eyes open in the chlorinated pool. Now your vacationing friends will wonder if one of the mermaids just blew a kiss their way. Yes, she did, you'll say, and remind them that you can't get this up North.