Yes, that's the basic idea: you head out Interstate 10 west until central Arizona, then switch to Interstate 8. According to MapQuest:
Miami FL to San Diego, CA 92129-2128
Total Estimated Time: 39.0 hours 6 minutes
Total Estimated Distance: 2670.06 miles
I guess I shouldn't have let on that I'll be out of town during the
Festival of Fruit 2008. Aww shucks, I guess you could stay on Interstate 10 and meet me there!