Start at the San Clemente Pier and run the Perimeter of the city from the end of the Pier to the San Clemente Summit and back to end of the Pier. This is a 26 mile mixed road / trail run with beautiful views. 

The trek along the Mammoth Crest - Duck Pass route offers stunning views of the Ritter Range, Middle Fork of the San Joaquin River Canyon, Duck Lake and the Silver Divide. Along the way the trail enters into the John Muir Wilderness and passes by Deer Lakes, drops down to Duck Lake which is tucked in a huge cirque of jagged 11,000-ft.

From CDT TH (on Hwy 547):  Singletrack for the majority of the mileage, a few miles of 2 track, and a few of improved dirt road.  Water availability limited along the route itself, a few springs can be found with detours.