Yeah, the "waiting for a window" doesn't really work if you're there for less than 2 weeks at a time. It might... But it might not. <img src="http://www.traveltalkonline.com/forums/images/graemlins/Tonguea.gif" alt="" />
But St. Croix is close enough to work it into a regular VI trip- a day down, a day or 2 there, a day back.

It makes me uncomfortable that there's so little information available... More research is needed.