Devils Millhopper Geological State Park is a 63-acre park with a picnic area and a couple of trails. The main feature of the park is a huge sinkhole—about 120 feet deep and 500 feet across—filled with lush vegetation and small streams and waterfalls, which can be viewed from a boardwalk that descends to the bottom. There is also a trail that runs around the rim of the sinkhole.
This is a beautiful place to visit, but it’s best to avoid going during the summer months, as the heat can become unbearable down in the sink. The best time to visit is on a weekday when there are not many other people around—it’s wonderfully relaxing to just sit on one of the benches surrounded by the sound of birds and trickling water.
The park is open from 9am to 5pm. Wednesday through Sunday (closed Monday and Tuesday). Guided ranger walks are available Saturdays at 10am.
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Devil's Millhopper Geological State Park for more information.