Hey,
If somebody from Central NJ is here, I created the list of Kids Entertainment Places in Central NJ:
https://goo.gl/maps/igSDuha1nm97wxLA9
It contains different parks and playgrounds mostly.
When I just moved to the US a couple of years ago, I know how it may be complicated to figure out what’s going on around, and where to go with your kids. If somebody showed me such a list those times, I would cheer a beer! 
Anyway, I think it might be useful even for those who live pretty much long in here.
If you know any other places around here, don’t hesitate to add them or just let me know in comments. I will visit them for sure in the nearest time and add them to the list with my impressions 
Thanks!