I was a little concerned about the sargassum before we left as well. We just got back from a week long charter. Being the sargassum comes from the north I found the northern beaches to be more affected than the southern beaches. We overnighted at marina cay and snorkeled at diamond reef. There was a lot of it there when we snorkeled, but a few hours after it moved south and was clear at diamond reef. At Anegada a lot of sargassum was washed up on Loblolly Beach, but Cow Wreck Beach was clear and stunning. Didn't get a look at Trellis Bay. I would say the sargassum did not affect our trip.