Leonard Park in Polk City has a fun playground with a rope climber. It also has a tether ball, which I haven't seen since my elementary school days. Street parking is available just north of the playground near a cul-de-sac (no parking is allowed in the cul-de-sac). Another option is across the street because there's a tunnel under road, which connects to several paved trails including the Neal Smith Trail.
Play Structure: Ages 5-12
Surface: wood chips
Swings: traditional, toddler, adaptive
Restrooms: portable year-round
Parking: street parking, moderate walk to playground