A kid weightlifting gym?

A thought on my mind; trying to figure out virtuous ways to spend and kill time with Seneca, typically we just go to the local outdoor mall, the Irvine spectrum, and just walk around. However what I would love would be some sort of open air, or indoor outdoor gym for kids. Not one of those stupid ones with slides and stuff, but like the ancient Spartans, with weights, mini atlas stones for kids, stuff to throw around, etc.