C.J.
I think I know the one Katie P is talking about. It could be off forest park in a little neighbor hood park up the hill from the zoo between Mistletoe and Berkley. If not, there is one there. Also there are two in Trinity Valley Park. The park where Mayfest is held and where the little train makes its midway point stop for popcorn and coke. They are both near the playground equipment.
best of luck.