The aquatic playground is actually at their public pool, and there's a $4 entry fee (kids two and under are free with a paying adult). The admission allows kids to use the outdoor aquatic playground and the big pool with diving boards.
The swimming pool is indoors, but there are doors that open out to the aquatic playground. There's not really shade over the aquatic playground, but many of the pool chairs are shaded if the kiddos need a break from the sun. Also outside is a small basketball hoop for kids.
The kids loved the water, and it was shallow enough (maybe about 18 inches deep in the middle) that I could sit on a pool chair and observe while the kids played. It was zero entry, so that was nice for little kids to be able to get in and out relatively easily. There was also a lifeguard on duty, so that made it worth the entry fee! The kids splashed and "swam" for about an hour.
I thought it was a great find. It's a small enough area where I didn't have to worry about losing them, and I really appreciated the extra set of eyes on the kids as the lifeguards kept watch. This is a good choice for a parent who is juggling more than one little kid but wants to go to a pool-type place.