 Leonard Harrison State Park is a destination for avid hikers , with some challenging hikes in and around the Grand Canyon of Pennsylvania . The park has 4 @.@ 6 miles ( 7 @.@ 4 km ) of trails that feature very rugged terrain , pass close to steep cliffs , and can be slick in some areas . In 2003 , the DCNR reported that 37 @,@ 775 people used the trails in the park , and another 24 @,@ 407 bicycled in it . 
