We were there 2 weeks ago- spent all of our beach time on the French side so can only speak of that. At that time, the only beach that had any sargasso deposits was Orient and the area by the ferry boat to Pinel (cul-de-sac). On Orient, it was more noticeable toward the Mt. Vernon end- and almost non-existent on the Club O end. The big beach bars (Kontiki, Bikini and Kakao) each morning had staff that raked the deposits into a more pleasing pile away from the front row of chairs. At Orient, it wasn't a ton just enough to need raking and there was no problem with smell. I suspect the area down by Mt. Vernon could get odiferous as it's not maintained and piles up more and more daily on the beach. The Cul-de-sac bay was pretty smelly and it was very thick in the water. Once you got out of it on the way to Pinel- it was no problem at all. Pinel had none, Anse Marcel had none, Grand Case had none, Friar's and Happy had none.