Soak City is great. As far as rides go, there are 9 inner tube slides, 3 of which are dark. There are 5 body slides and 2 of them are speed slides. There is a family raft ride which can accomodate up to 4 people at once. Soak City also has 2 lazy rivers (one of them has waves), a wave pool, and at least 2 different areas for the kiddies.
On a hot day in the summer, expect it to be crowded. I would recommend going there right after they open or just before closing to avoid some of the crowd. (Or be a diehard like me and go early in the season when it hasn't warmed all the way up yet. The whole park will be yours.)
Inner tubes are free and are all over the park. Lockers cost only $3 for the day with a $5 key deposit.
My opinion: It is a great waterpark and definately worth the trip. I hope this helps. Have fun!
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Honest truth told to me by marina gate readmissions host:
Host: Hand stamped, two cents.
Me: That's cool, I think I have two cents.
Host: I better not take it, by the time you leave here its all you'll have.