For Grand Turk, we took an excursion called "Home Sweet Home." It was awesome! They pick you up at the pier and take you to a beach house, where there are enough lounge chairs and umbrellas for everyone, right along the water. They have kayaks and other water sport equipment available as part of your fee; we kayaked for a little bit, and it was lovely. The beach is very clean and the water is crystal clear. We lucked out and got perfect weather, too. Chef Carmen whipped us up an amazing lunch of pork, chicken, coleslaw, pasta and stewed veggies, all included. Also included: beer, pop and rum punch. You could go inside the house to watch TV (but why would you want to?), use the bathroom and/or change your clothes. They had free wi-fi. It was incredibly relaxing and I would do it again in a heartbeat.
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