There are quite a few things to see in Europe ;)
Festival-wise: You come in just in time for that http://roskilde-festival.dk/
. One hell of a party :)
As for things to see, definitely Alps. (I'm at work so I'll just drop a bunch of places for You to google out ;) ) Grossglockner Hochalpenstrasse, Stelvio Pass. For easter europe: http://en.wikipedia.org/wiki/Transfăgărășan
, is a really nice drive along the coast of Croatia.
Or... You could take direction up north towards Nordcap, see Geiranger Fjord, Lofoten and other wonders of Norway. Maybe if You'll be passing on a weekend then I could join in for a small trip with my SO ;)
Sorry for a messy post, I'm halfway through my first morning coffee ;)