Hello! Not exactly a park, but have you heard of Hunsader Farms? It is on 675 between SR64 and SR70. It is great, my kids love it there (boys ages 2, 5, and 7)! They do birthday parties there and have a train, animal feeding, picnic area, ice cream shop, playground, tricycles, sandbox, it is great! You can also buy fresh fruits and vegetables which is why we go there. We can stay for hours and the kids never get bored, plus it is so quiet and peaceful, which with 3 boys I don't get very often:) Good luck and happy birthday to your son!