Webb,
The St. Kitts Island Tour is quite interesting, and it affords some spectacular views, especially from the fort (which, BTW, is one of the more impressive forts of that era that I have seen). On the other hand, I really had hoped to take the Sailaway to Nevis but it was sold out....
BTW, there's a "Caribbean" message board on the "Ports of Call" section where you will find a lot more information about the various ports of call in the Caribbean.
Norm.