What to say?
France looks all alike: hills and hills.
Cities in that part of Germany and France are more or less same style.
If you want to make a detour.... go to Paris! :s
Not far and at least you can have a quick tour and say: I've been in Paris with my Harley!
Another place nice to see is the most typical Swiss Canton, Appenzel, but it's on the other side of Switzerland, towards Germany and takes less than two hours from Lugano.
From there you can go to St. Gallen (UNESCO site) and have a very good beer too!
I'd spend one day in Switzerland that is worth to see and then maybe go to visit Luxembourg: a fairy tale place!
Never been there, but people I know say that it's nice, clean and mountainous.
From there go to Belgium passing through the Ardennes and then to Calais.
Don't waste your time in Brussels: not worth a visit (BTW I'll be there next week...)
Out of Switzerland there are no customs, so you can pass easily from France to Germany to Luxembourg to Belgium depending on where you feel like to go with no waste of time at the border!
Just my two cents
Ugo