Saints Row 2

- Once activities open up, one of the first ones you should do is the insurance fraud activity in the factories district and beat all of it's levels for unlimited sprint.

- You may also want to do Escort in the Red Light District for vehicle delivery.

- Try to get the 3 star base jump as soon as possible, too, since the reward is crazy good.

- Also, if you're on PC, get "Gentlemen of the Row" http://idolninja.com/sr2.php. It's basically the essential mod, fixes lots of bugs and performance issues and improves the game massively overall.