I doubt you will be able to trade into the Westin during a specific week in April, especially a holiday week. It is very hard to do but you never know, you might get lucky.
I also happen to agree with jel0511. I don't think the location of the villas is that great and the beach is poor. We stayed there a few years ago after leaving our hotel in the BVI. The hotel portion of the property is on the water, but the villas are not. When we chose to go back this past April, we chose to stay at Caneel Bay instead, where the beaches are amazing.
HBC