Took on a little research while waiting, since there does seem to be some interest, although not a huge range of options, seems fair to share.

So. For those coming after with the same question:

Belize operation - large groups only now
http://www.underthesunbelize.com/1a7_info.html

How's your French?
http://www.hobiecataventures.com
They have dates for trips to Turkey this year. A little further than we were thinking.

Discussion here about Florida. Little nearer than we were thinking
http://www.catsailor.com/forums/ubb...ords=vacation&Search=true#Post257512

Beach Rental, San Juan PR
http://www.prtc.net/~jackie1/index4.htm

Bitter End Yacht Club BVI
http://www.beyc.com/index.php/resort
(This is probably closest to what we're looking for.)

Resorts
Club Med Turks & Caicos
http://www.catsailor.com/forums/ubb...ords=Caribbean&Search=true#Post56629

Nonsuch Bay Resort Antigua
http://www.nonsuchbayresort.com/activities

Of course - still very open to anyone else's ideas!