OK, one thing I would say that is the seaweed does seem to be fairly seasonal, usually only in the summer months. So, if you can shift to another time period during the year, you hopefully should be able to avoid the seaweed.

As far as other places similar to Orient, are you looking for islands with a French feel and do you want a nude beach possibility? If so, my feeling is I don't think you are going to find it in the Caribbean, other than possibly Guadelupe or Martinique. St. Barts, if you have tons of money. I really don't have any idea how the seaweed is affecting those islands, as it seems to be a big problem throughout most of the Caribbean in the summer. Possibly mainland France, but of course only in the summer.

If you don't need nude beaches or a French feel, you could try Cane Garden Bay on Tortola. That's about the only other suggestion I would have. Best wishes.