Greenwood Furnace State Park offers 423 acres including a six-acre lake and is surrounded by Rothrock State Forest. There are 12 hiking trails ranging from 0.5 miles to 72 miles. Some trails are more difficult whereas some are very easy.
The entrance to Greenwood Furnace State Park is on PA 305; a 10-minute drive west of Belleville or a 35-minute drive southeast of State College.
http://www.tripleblaze.com/trail.php?c=3&i=5287