What is the minimum age for this? I have a 3 year old active boy -- can he participate?

The Sky Tykes area is $8 and only for accompanied guests under 48" tall.

They have a smaller area for young children

I don't see a three year old doing the main activity, the ropes course. You have to be tall enough (our youngest barely made it and she's much older). But there is other stuff to do like rock walls