I'm a recent transplant from San Diego- I just moved up to the Fresno/Clovis area. I don't really know where there is to go ride, apparently there isn't much in the valley... Where are some good places for a beginner-ish type rider to go?
Riverfront Park, Marysville http://marysvillemx.com
There is also Argyll Park 11 Miles south of Dixon on Hwy 113, Carnegie OHV park near Tracy, Club Moto in Livermore.
See the "Where to Ride" at the top of this forum.
There's some nice MX tracks near you but they aren't that beginner friendly. CMA (www.cmaracing.com) and AMP (www.ampracing.com) promote all the races in the Central Valley.
Go to www.thumpertalk.com and look in the California forum. There's a group of people from your area who trail ride. Submit a post there...