Leave the wallet where I found it
Take the wallet
Just take the cash, leave the rest
Just take the credit card, leave the rest
Take it to a police station
Try to track down the owner (via adress on the license)
Track down the owner. That's what I would want. I never carry lots of cash, but it's a major hassle replacing all the other crap. Hell, you can keep my $14 if you need it that bad.
Wow. Am I awesome or what?
If needed I'll probably take the cash, then try to contact the owner to give him the rest.