Crowkeeper over at MTS has developed a beautiful new world that seems to me more like an expansion pack than just a world! It has a hidden island, caves to explore, six dive spots. And the beauty of it is just incredible. Here's a short video showcasing some of the artwork. Fill it full of mermaids, regular peeps or a mix! It has a vacation location also if you just want to use Traveler and vacation there, though it's unpopulated.