GeorgeJ is correct on Marriott. At Residence Inn, TownePlace Suites and MVCI (the timeshares) members can redeem for two bedrooms. Unfortunately, there is only a Marriott and a Renaissance hotel on USVI.

There is a timeshare in Aruba, but I would stick with USVI. Maybe you can call the hotel directly and ask (or pay a fee) to upgrade???