Best tour ? Anything to Brimstone Hill Fort
I just loved the place back in April. Out of St Thomas, St Lucia, Antigua, Barbados, and Dominica...St Kitts was my favorite island on the Southern Caribbean itinerary that I took. Others that I talked with felt the same way.
Sorry that I'm very little help there. I might be wrong ( happens quit a bit ) but I didn't get the impression that St Kitts is much of a beach destination. Reading in Carnival's 2008 shore excursions booklet...
Mountain Bike & Beach
Town & Frigate beach
Those are the only St Kitts excursions listed where one might get wet.