If you take a look around a bit, you'll find that West Coast trips are easily among the most popular and most discussed trips on this forum - and for good reason.

Just a short list of the possible detours would include Joshua Tree NP, Sequoia, Yosemite, Crater Lake, and all of the Pacific Coast! That's not even close to a complete list, but it hits some of the most popular. You can find many more ideas by searching around this site. Which places will work best or you depend upon your interests and the amount of time you have available.