Friedrich Wilderness Park is one of the better places to hike and run in San Antonio. There are about 4.5 miles of improved and natural surface trails (mostly natural surface) within the park. Elevation within the park ranges from 1150 feet to 1400 feet, so there are some decent climbs on the main loop trail.

All of the other trails come off of the main loop trail (except for the short Forest Range ADA nature trails at the park entrance).

You can find more information at the Friends of Friedrich Park