SAB is the pool complex for YC, BC, and BCV guests. It's really two giant pools that are really close together--the BC side has the slide from the pirate ship and the whirlpool; the YC side has the lazy river and the kiddie pool is on that side, too. There are parts with a sand bottom, even parts where there is sinking sand. The kiddie part has a sand beach for castles and so forth. I read somewhere (I think) that the total area is about 2-1/2 acres. The lifeguards definitely were on wristband patrol for the time I was there (last week). I forgot my room key once, and they asked me to go back and get it...and of course our room was about as far away as you can get from the pool... (so I got another key made at the front desk!). It was a nice and lazy vacation!