Re: best golf courses playedI'm not nearly as well-traveled as many of you here and haven't played a lot of the "big name" courses, but here are my best/favorites (no particular order except the first).
Primm Valley GC (Desert and Lakes Courses) - Primm, CA/NV
Oak Quarry GC - Riverside, CA
Trilogy at Glen Ivy - Corona, CA
Redhawk GC - Temecula, CA
Refuge CC (Private) - Lake Havasu City, AZ
Los Verdes GC - Rancho Palos Verdes, CA
Fallbrook GC - Fallbrook, CA
The Primm courses would definitely be my favorites on the list. I've played them annually for the past 11 years (yearly invitational tournament with a bunch of friends), and it's a trip I look forward to all year long. Excellent, challenging courses that have been in pristine condition every time we've played there.