Boardwalk has the large Clown pool. The slide is pretty long and is supposed to simulate a Roller Coaster. My son loved that slide and spent a lot of time going down it.
There is also a hot tub and a kiddie pool next to the pool.
My family really enjoyed the Luna Park pool area. The theme is nicely done and the staff was very friendly. My kids loved the slide and pool area. DH and I logged time at the pool bar (keeping an eye on our kids and the winter olympics last year!).