Aww, I'm the only person who voted for racing...
But you can't blame a man for loving racing games. They're easy and hard, usually have differing difficulties, tons of replay value, and if you've got some friends to play with (and split-screen preferred) its the most fun you can possibly have outside of something like Smash Bros. or Mario Party.
Seriously, nothing more fun than racing along, both you and the friend doing swimmingly, then as the finish line comes into view, the race turns into a demo derby.