On St Kitt's I liked Turtle Beach. It is a little bit remote (about a 45 drive from town) but the beach is nice, the views of Nevis are great, the little beach bar/restaurant is friendly (they supply free beach chairs and a primitive outdoor shower and a clean but small washroom) and if you are not careful the monkees will steal your drink. Just a nice laid back place to relax, swim, and snorkel a bit.