Perhaps take a train to Munich & then drive down through Bavaria to Ludwigshafen & board a boat across to Switzerland.
From there drive East or South East to Austria & then further south into Italy just south of the Dolmites. Visit Lake Garda & Verona.
After that go as far south as you want to. Florence, Pisa & the Mediterranean coast may be possible
You can then take in South Tirol on the return trip heading north to wherever you want to be.
Get the map out & check what wonderful places Europe has to offer any visitor.
Oh and don't forget the food; you won't want to go back home!
Cheers
John