oh man..there is so much out here to see too.
what are you guys into?
you can go skiing in the morning and lay on the beach in the afternoon. O.o
San Fran has awesome food! and the coolest chinatown i have ever seen..beats my beloved chi-town chinatown!
LA...well, it's LA. nuff said. hiking in the mountains, LA zoo, Santa Monica pier is about 45mins away on the 101. downtown LA... Huntington beach is a good one...Laguna beach is supposed to be gorgeous too. shopping at the Grove in Hollywood is really cool. you can go see the rich folks over in Beverly Hills...i don't think Fresh Prince lives there anymore. ;)
you can also do an interesting road trip from LA up the coast on route 1 to San Fran. It is a long a$$ drive with too many hairpin turns...but it is a seriously amazing landscape to see. I will never forget that trip..even with the white knuckles. (i was the driver)
also, don't forget the wine country. they have Amtrak train packages that go specifically to the wine vineyards. that i would have liked to do.
south...yep. San Diego..and TJ is just over the border..if you bring your passports.
thats about all the suggestions i can off. i haven't been to the extreme north of CA.