Hi Hirbman,
Since you are starting your trek in the SF area, I would suggest a visit to Monterey CA. Not far from SF, they have a really cool aquairium there and there is Canery Row which has allot of great restaurants. The legendary Laguna Seca road course is also nearby, although I don't what kind of tourist opps there are there.
As you work your way down the coast there is also Big Sur, Half Moon Bay, Montecito, Santa Barbra, and a great little suedo Dutch town called Solvang. Be sure and hit one the Anderson's (a chain of restaurants) for some of their split pea and ham soup. There is also a nice little town of Arroyo Grande which is close to Pismo beach. This area is a good spot for wine tasting and if you're interested I know of a good wine tasting, and cycling tour company called "Breaking away Tours". It's run by a High school aquaitence of mine
If you are interested I might, I stress might, be able to get you some free passes to DisneyLand as my best friend is an Electricial there.
If you venture inland a bit from the coast on your drive down you will be in the classic california area with rolling brown hills, and lot's of Oak Tree's. There is also another great wine area in Sonoma which is closer to SF area. Since you are driving you might even consider a trip through Yosemite, but, it will be very crowded that time of year, but, I would think less crowded during the week.
Everything east of SF and Sacramento is Gold Rush country and there is allot to see in that area as well. It would be a great drive if you visited Coloma, site of gold discovery in 1948, and took Highway 49 south from there and visited GeorgeTown, starting point of the infamous Jeeper's Jamboree. This route will take you through "Gold Country" and past the Forks of the American River where you should be able to take in some white water rafting as we have had record snow falls (19 feet) in the Sierra Nevada's so far, and we aren't really into our rainy season yet!
I don't do much riding in the desert during the summer either, although there is a couple of races on the calendar for August this year. My friends and I usually go up to the Sierra's in the Sequoia National forest which is just north of Lake Isabella at about 8400'. There are some nice drives in this area as well on narrow winding roads. I can even show you where to look for Indian arrow heads in this area. There are many trails in this area that are multi use trails, bikes, Dirt Bikes, horses, and hikers. There is a stereo type that Germans like to Hike, and if you do, there is plenty of hiking in this area as well. There are also some hiking only area's in this area as well. There are known as wilderness area's.
Anyway, if you would like, I can gather maps and mark all of these places for you and send them to you if you like. There is much to see in California.
Hope this helps,