If you bring your own tube I believe it has to be clear, so the lifeguards can see through it. The cost to rent is minimal, just a dollar or two; I believe the whole day price is $6. They are really only fun for the lazy river portion, they are too big and bulky to do much else with. When there aren't many people at SAB they close down the rental booth part and leave the tubes out for anyone to use. This happened to us a couple of weeks ago when it was rainy out and only a handful of people were in the pool. No ap discount that I know of (we are ap holders so I probably would have noticed). HTH