I've done a few eu trips in the zed, Monza for the gp in sept is good, the high alp passes are still snow closed until mid to late june and august can be a nightmare for traffic. So plan for July or sept to be able to get the roof down and have some fun, another good run is down the west of France, a play in the pyranees, Andorra is great, and you can get a 1 day mini cruise back from Santander. If you want a longer trip, the amalfi coast is truly special and you can visit Ferrari and lambo as you go through northern Italy. Stay as clear from Naples as you can though, its scarilly bonkers.