I heard someone mention Crystal Park in Compton, I frequent the track with my Traxxas E-Maxx, though I am in the process of upgrading to brushless and will be out for some weeks. Here is a vidoe of the off road and on road. Though it is mainly nitro, I run electric.
Off Road
http://youtube.com/watch?v=cp4wylmAZCQ
On Road
http://youtube.com/watch?v=xYVOdW6Dt9M