The Morris Arboretum of the University of Pennsylvania in Chestnut Hill offers a discount for those who arrive by bicycle. Bicyclists can visit the grounds for $7. Normal admission for non-members is $14.
Getting to the Morris Arboretum is easy. Take the Wissahickon Bikeway and Forbidden Drive to the end and turn right on Northwestern Avenue. Cross Germantown Ave and proceed on Northwestern Ave to the entrance on the left.
For more information go to http://morrisarboretum.org.
From Bicycle Coalition of Greater Philadelphia