If you are looking to book a party, unfortunately you can’t according to the Toms River website.  See this link for further explanation.

North Bay Avenue & Oak Avenue, Toms River, NJ.  What a great playground, my sons both had a wonderful time.  We spent the day at Blackbeard’s cave http://www.blackbeardscave.com/ ($18 for wristband from 12-5pm on sunday) and then came over here for some more play. It was a full day and the kids want to go back!  At Castle Park II there are 2 playgrounds, a pre-school age 2-5 and school-age 5-10. It is a very popular place with tons of kids. There are 2 toddler swings and more bigger swings. Slides, sway-fun (big swaying apparatus, see pic), and lots of castle structures.  See the pics for details.