Puerto Rico & SUAs

We are staying in Puerto Rico at the Regency Grand Reserve soon and also recently earned the 50 night SUAs. We will only be Explorist but this stay will be enough to make Globalist.

Is this resort worth using one of the SUAs?

We plan on using the other 3 at The Cape, Regency Tokyo Shinjuku, and Park Hyatt Seoul to upgrade existing bookings. Any tips for those?

TIA!