Noodles should be fine. I wouldn't bring something like a big inflatable raft, or a floating chaise, or anything like that. The lifeguards don't want anything in the pool that blocks an area of the water from their vision - they wouldn't be able to see if a child was under that big chaise and in trouble, for instance.
They also don't want something in the pool that takes up a large amount of space, making the pool more crowded for the other guests.