just did an 18 day driving tour starting at munich to herrenchiemsee where the newer palace of versailles was built as a replica in the middle of the lake(1) to berchestgaden(4)konigsee, obersalzberg(hitlers documentation), watzmann therme,(health spa) salt mine, salzbergwerk. Salzberg, austrian lake district of hallstadtt, st wolfgang. it is much more scenic, friendlier and cheaper around berchestgaden.
we did the bavarian alps along the southern border ending in fussen(1) or reutte to see hohenschwangau and neuscheiwanstein castles. I recommend that u do bodeensee, lake constance and stay in meersberg(1) as your base. ride the ferry to switzerland to constance and mainau the island garden with a butterfly farm. meersberg is magical. it has the largest waterwheel in germany, really picturesque buildings and a good promenade with great restaurants.
then head north to stuttgart(1) for the mercedes benz museum, heidelberg(1) n rothenberg(1)to munich. switzerland is twice as expensive.