I've been to the BVI about ten times, first on sailing trips, more recently on sail/dive.
The Rhone is a definite hit. In my experience most of the snorklers are in a party with divers and there aren't many.
The Indians, northwest of The Bight on Norman Island is another "don't miss." It's not challenging (only about 30'), but there is a passage to a sheltered area in the middle that is warmer than the surrounding area (sun on the sandy bottom) and clogged with fish. Eat at the William Thornton anchored in The Bight.
There are half-a-dozen good spots around the Dogs, a cluster of small islands between Virgin Gorda and Tortola.
Try to get a break at Marina Cay between Tortola, Beef Island, and the Caminoes. Beautiful place.
I've never done a Windjammer, hope it works for you. Our next bareboat (Moorings/Underwater Safaris) is August 2002.
dave-man