You have to check with the life guard but I think that floats have to be clear so that the lifeguards can see through them. I've never seen anyone use a personal float in the lazy river.
You can bring the pool noodles. They sell them at the marketplace, too. You can also bring your own life jacket if you have a non-swimmer who wants to go through the deep end.
I brought a noodle. The floats provided are in short supply. A family of 4 joins together essentially making a dam. No way around With a float. I was able to get around them with the noodle but was pretty exhausting with having to kick so much.