Some sections are pretty technical. What they lack in quantity they make up for in quality. Watch out for rattlesnakes, I see them on the trails pretty regularly and if you're not paying attention it's easy to ride into them. LOTS of access points and trailheads. There's not alot of tree cover here either, but it is still as nice, fairly scenic ride.
Roads are very popular with road cyclists.
Convenient, fun, and nice weather. Some of the fireroads have ruts. They will toss you, believe me. If you ride here, you MUST get a bite to eat at the Alpine Inn with the rest of the cyclist crowd. Be nice to horses, they keep some of the trails rideable in wet weather.