The play barn at Wilson's Orchard & Farm is fun for all ages. My 10 year old son enjoyed the second and third levels which are intended for older kids. In fact, the slide on the third level has a sign that says "Must be 10+ to climb here."
On Wednesdays and Thursdays, admission is $1.00 and you pay at the farm market. Friday through Sunday, admission is $6.00 and you pay at the farmyard (play area) entrance.