For a definitive answer, you're going to have to call AKL, but I'd have to bet that they wouldn't let you use a float, or an infant ring. Neither are true personal flotation devices, so AKL wouldn't want the liability that would come with guests using floats.
The lifeguards at AKL were very attentive/strict during our stay there in October - they policed not only the actual pool and conduct there, but the immediate pool deck as well. We were told that we couldn't be near the pool edge with our beverages (bought at the pool bar, and in plastic cups) and children were told not to stand on each other's shoulders/cannonball into the pool, etc. Going down the slide with your child on your lap was a big no-no too. Of course these are all safety issues, but I was just surprised by how vigilant these lifeguards were! Actually, I think they were doing a fantastic job, and I felt that my kids were safe even when they were across the pool from me.
Schmeck