Dead Rising 2 is another representative of those games where you can just stupidly run, wander, beat up everything and everyone and still have fun.
At your disposal is a huge shopping center, which is filled to capacity with crowds of zombies, and a bunch of different Easter eggs, surprises and secrets. Two-person co-op allows you to have twice the fun. After all, chopping zombies into cabbage is certainly more fun side by side with a friend than alone.
I definitely recommend this game for you to try.