Double Peak Challenge 
This is quite possibly the most challenging 10K distance course in San Diego County.  The multi-surface paths through San Elijo Hills and Double Peak offer runners the option of running on asphalt or decomposed granite.  Make no mistake, this out-and-back course is steep, but runners are rewarded with panoramic views of the entire North County and a breathtaking summit halfway point.  
Jogging strollers are not advised due to very steep inclines on the 10K course.