For example (and this list is obviously not exhaustive;-)), I love photography (see http://www.flickr.com/photos/jorritspictures/sets/72157607059396330/ for some of my pictures), modern art, philosophical discussions, beer, friends, travel, whisky, books, music festivals, science, games, writing, movies, theatre, squash, tv series, concerts, cooking, history, science, eating, foreign people and cultures, and basically everything else. But most of all I just like being around interesting people and doing interesting things, having intellectual discussions or just making weird jokes and getting wasted on Orval.
I also like to try new things at least once, and preferably more often if they're cool. I've lived in Paris for 6 months for example, which was an amazing experience and really puts the tiny Netherlands into perspective. (I have to admit I actually prefer Berlin over Paris as city though, but don't tell anyone...)