When we were there in Feb we had a "bubble" for my daughter and there were some people that had dive rings in the pool. Of course, it was cool so the pool was not overly crowded. I don't think they allow floats or anything large like that.
They will allow floats for little ones in the pool as long as they are technically "sitting" in it. Ie. couldn't use a "ring" but we could use a little boat thing that had an actual plastic part that my ds sat in.