We will be hiking along the creek & turning over rocks at White Clay Creek State Park in Newark Delaware (roughly an hour away from Philly). We leave from Germantown Friends school (31 W Coulter Street Philadelphia 19144) at 9am and return to Germantown Friends by 6pm Saturday night. Any volunteers can ride with Sharon and be dropped off afterwards by 4:30pm at Germantown Friends (slightly earlier return).
See Info Here: http://www.destateparks.com/park/white-clay-creek/
Thanks for the suggestions on Morris Arboretum - we listened to you and will try to fit that one in soon.