Anyone in the Philadelphia, PA area, primarily Philly (Wissahickon, Pennypack) and north. (Nockamixon, Neshaminy, Core Creek, Green Lane) Also up in the Bethlehem area, with occasional forays north of the Poconos - Prompton, Moosic, etc.
Occasionally the trails of Case Mountain near Hartford/Manchester/Glastonbury, CT.
VERY infrequently on the trails of the Bicycle Post trail system in Greenville, NC.