Good idea thinking ahead!
So, all Sandals & Beaches Resorts do have USA-type plugs and USB ports, which you can use. However, islands with more recent British influence (like St Lucia, Barbados, etc) tend to have a LOT of British-style plugs. As such, you might find that you have more limited US-type plugs than you expected, depending on the room you are in.
A simple solution: if you head over to my packing essentials recommendations page (and scroll to the bottom), I have listed some cheap adaptor styles you might consider tossing in a suitcase! 🙂
