If jogging is your thing but you're stuck running around the block then WalkJogRun app might very well be of some use to you. Simply put it's an app that will help you find out good spots to jog thanks to a huge database created by users around the world.
It uses the embedded GPS to find the closest trails, gives you informations about how long or difficult they are and can even predict how many calories you'll be burning.
It's actually the iPhone version of the WalkJogRun website but it's really a more convenient way to access it.
But Don't you think it's a little bit weird to run around like this with no purpose?