Take I-20 to Hulen Road Exit.  Turn on Hulen and head south. Turn right on Granbury Road. Turn right on Wolens Way to enter the park. LeBlanc Park is on the right.

When you're traveling down I-20 towards Hulen, you'll actually pass the Granbury Road exit a few miles before.  You could exit Granbury Road and just follow it all the way - when you hit the point where Hulen and Granbury intersect then you only have a couple more blocks (on Granbury) to go...