For my kid's party last year, we held it at Waterworld and it was great! I set it up online for for 19.99 per ticket, same pricing as a regular ticket... but because its the birthday package, you also get a reserved table (with coverage from the sun), pizza, ice cream and soda for everyone. You normally get the food all at once but we asked if we could save the ice cream for later and they were totally flexible. They even gave us fresh soda when we came back! Minimum purchase amount is 8 tickets, but with that, you get a 9th ticket free, plus free inner tube rental for the birthday kid. Seems like if youre going with a group of friends, you should get the birthday bash anyways, even if its no one's birthday, since its such a good deal! Plus all the kids (and even the adults) had a great time going on all the water rides!