Good value, will go back soon.
Our family of three (including 6 year old boy) spent a fun half-day here. Attractions are height restricted not necessarily age restricted. Under 48" for the toddler areas, 48" & over for the big kids slides. Some in between are for 42" and over.
We bought tickets online at the Splashtown website and printed at home, no convenience charge fee, the discount was about 28% ($7 off) if you plan for a Monday thru Thursday visit, but there is still a discount for weekend visits too ($5 off).
Parking is free and there is a shaded picnic area outside the park to bring your own meal. Concession stand is reasonably priced considering you are a mostly captive audience. But you can leave and come back in if you want to snack at the outside the park picnic area.
Changing rooms were large, clean, and organized. Locker rental is $4 after your deposit is returned. Pack light when you actually enter the park if you plan to rent just one locker, we squeezed in 3 sets of clothes & shoes, 3 towels, and a woman's purse, but it took a little re-arranging. We wore swim shoes for the cement sidewalks just to be safe.
Lifeguards appeared plentiful and attentive, I heard plenty of whistles in the kids area keeping them in control. There were plenty of floats around, the lines for the popular attractions weren't too long considering school is already out (Tuesday visit). Another review here or somewhere else I read complained about safety concerns of the structures, I too felt the tall towers swaying, but any engineer or building contractor will tell you that's normal for 4 to 6 story tall set of metal and cement stairs. Try taking a trip up the Empire State Building if you really want swaying. I didn't see any wear or tear on any of the attractions that concerned me for the safety of my family.
Lastly, if your on a time schedule wear a water resistant watch, I couldn't find a clock on any of the buildings in plain site to keep track of the time.