I only recently discovered that there are stunt jumps and barnstorm challenges in this game, for making your car fly and your planes nearly crash, respectively. There's no achievement that tracks these, they aren't in the Saintsbook, and they aren't marked on the map to make them easy to find.
Is there anything that you get from doing all/some portion of these that makes them worth doing? Some of the challenges/missions have crazy rewards, so I don't want to miss out on something awesome here.
If it's worth pursuing, is there any way to make this easier? Say, a map with the locations marked?