We just got back from the Surf Club. The lazy river was running just fine. At times it was very crowded, not many people going in the ocean. The ocean floor at the Surf Club was very mushy, but if you go out far enough it's not too bad. Just don't touch bottom. A couple times my foot sunk into some mushy mess.

There also wasn't many people in the water in front of the Ocean Club. The hotel had people in their water. I also saw some people from our area walk over to the hotel and get in over there.
The water did have a rotten egg smell, especially when you stepped in the mushy stuff.
We went to the beach up by the lighthouse one day, Arashi or Malmok (always get them mixed up) and it was beautiful. Nice sandy bottom and clear waters. Baby beach was wonderful too.
It wasn't just the Marriott beach, it was worse in front of the Holiday Inn. It did seem to be a little bit better towards the end of our trip. I think it will clear up more and more as time passes.