Hi
I went to San Diego in February this year and went around for several trails. I think the best one was Noble Canyon Trail, some miles to drive from San Diego but absolutely worth it.
Los Penasquitos Canyon is probably the easiest and Noble Canyon the most difficult. Other trails fall in between such as Daley Ranch which has a combination of single track and fire roads.
The best for something local would be at PQ Canyon. There are serveal ride that leave from both the East and West sides in the evening. Try www.socalmtb.com or MTBR.com to see if anything organized is going on. There is a ton of singletrack on top trails if you find someone to hook up with that will show you around. Good luck!
go to azcoaching.com and email deeann. She lives out there and is a great coach. She should be able to give you some trails and groups to ride with. Tell her chad says hi
