A relatively easy 7 mile hike to a Grays Peak, elev 7,920' which overlooks the Big Bear Lake area.
This is a fairly easy mountain peak to climb. The trailhead is easily accessible right off of Hwy 38 by the town of Fawnskin. There is a large National Forest sign noting the parking area to Grays Peak Trail. Note that parking in this lot requires either a day pass or a California Adventure pass (either are easily obtainable from the nearby Big Bear Discovery Center).
The trail is 3.5 miles up to the summit, almost entirely on a well maintained single path trail (there is a short section however that overlaps with a local access road used by mountain bikers and the occasional automobile). The summit is a pile of boulders that's easy to hop on, and the lake is visible through the trees. To return, simply retrace your steps.