For those that want to explore the non-bikepark areas of the SBNF, I highly recommend downloading the Forest Service KMZ file with all the official service roads, OHV trails, and foot trails (linked here, or search for "San Bernardino Forest KMZ"). Open the file in Google Earth. The pic below is all the routes that are included. Blue is service roads, orange is OHV trails, brown and pink are foot trails, and green is PCT. The routes include the official FS names (I turned the labels off). All the routes have elevation data (right-click). Not everything is current (abandoned), and not everything out there is shown (understatement).