While most of the area is fairly frequently traveled and patrolled by hikers as well as the county sherrif's department, caution should be used when traveling through the forest. Some of the trails can be more strenuous than you may first suspect and leaving the trails can be dangerous. During the winter months there can be a good deal of snow and ice on the paths. Spend some time to research the trails, talk to the rangers, and make your time here as enjoyable as it should be. Also, the forest has seen its share of wildlife including bear and mountain lion. Take all necessary precautions when hiking, camping, or just wandering through.
fees/permits
Parking permits can be purchased at the ranger's station in Mount Baldy Village. On some days permits are not required. If you are cited the fee is usually just the amount of a parking pass.
Generally, most areas of the Angeles National Forest will require parked vehicles to show either a $5 day pass, or an Adventure Pass $30; valid for one year. The latter, which is also valid at three other National Forests in Southern California, can be purchased at local sporting goods stores. The ANF website provides a list of local vendors. (http://www.fs.fed.us/r5/s...)