Seaweed is a vast Caribbean islands wide problem. I was just on several islands and all of them are getting slammed on the Atlantic side with the seaweed. However, the Caribbean sides are fine. They do not have the seaweed issue.
For example, Plum Bay, Mullet Bay was perfect last week.
So was Meads bay on Anguilla.
It's annoying but should not stop you from traveling.

Rob