Find someone to stalk.
But stalk them properly!
It will involve lots of training.
You must find the finest ninja master in the land.
There are rumors that he lives in Philadelphia, so you should check there first. But before he'll train you, you must prove yourself worthy by stealing a single golden coin from a guarded safe deposit box in Baton Rouge.
Once you have finished your training(which should only take two days-the guy is good), then you need to locate your stalking target, and then commit yourself fully to following them everywhere
That should keep you busy.
Or, if that sounds like too much work, the Discovery Channel, History Channel, and Comedy Central are three wonders of time killing.
Finding some demos to play on your computer would also be a good idea.