We loved Kelly's Grove, a park just a tad into Hobble Creek Canyon (near Springville). A shallow river to wade in, wilder places to explore, pavillions to eat at, old school swingsets, baseball/kickball fields - we loved it. We went in the fall and it was SO PRETTY. SO GORGEOUS. In fact, I just wandered around for a while repeating myself about how beautiful everything was. KIND OF LIKE I'M DOING RIGHT NOW.
We went on a hike off in the reeds and found some kind of structure that it looked like hobos had been using. The kids thought that was pretty awesome but my probation officer husband thought it was Dangerous Because He Knows All About What These Kids Today Use Hobo Huts For.
You can find directions and info here: http://parks.springville.org/canyon-parks.html