Dweste touched on it when he mentioned raft. Seems to me the only way out on your own is via river. White water rafting is something I've never felt the urge to try . . .

Other than that, find a good place for a shelter and set up camp.

This thread reminds me why I carry so much gear and extra food/water when I travel. You never really know where you will be when it hits the fan and you are on your own.