Throwing darts at a map is a great idea. My roommate and I did that in Germany every Saturday morning. Throw three darts at the map. Before we could come home, we had to visit those three towns, drink a beer in each one, and if there was a castle or museum nearby, visit that too.
You can pick any attraction that interests you (a dance club, an art gallery, a zoo, or whatever). The important part is to go looking for something to find there and take pictures of it. We got sidetracked so many times. We would go to one town, ask a local if there were castles nearby, and they would point us to another town that was not very close. But we went anyway and had a great time.
Another fun thing we would do during the summer is go to an American Express Travel Office and see what tours were being offered. You might find something close by that sounds like fun, or maybe another adventure. I took a cheap Salzburg By Night Tour in Austria. I had so much fun, I came back to the city many times. Maybe that's all you need is to find a new area that you really like.
