Harmony State Park is a great place to ride a bike, certainly if you want a workout. The park is known for its hills.
An official three mile bike trail connects the pool to the campground. the first mile runs through flat woodland. The next two miles to the campground run next to the roadway, and include a big hill before you get to the campground.
The park loop, which begins at the turnoff to the Wabash River Picnic Area, is nine miles of paved road that is excellent for street bikes.The rest of the way is very hilly.