LA is a hole but I thought Beverly Hills (Rodeo Drive) was worth the effort alone - if you like seeing how the really rich spend their days.
Same goes for South Beach/Miami - hotspot for young people with too much money, but its an amazing place to be IMO, especially at night. Go to Mangos nightclub, bestest place ever!!
San Fran and San Diego are both great, visit Alcatraz and the San Diego Zoo in those 2 places.
Oh and hire a proper sports car (we got a Corvette) and drive Highway 1 a couple of times....such a brilliant piece of road!
Our pics/stories here :
http://www.perth-wrx.com/vb/showthre...light=corvette