Work your way down the moutain and try to get as many points as you can (around 40,000), this will give you a full bar in which now you can start to impress the bystanders in that area. Open up the map and go back to one of the checkpoints (areas where you start down the hill) now just try to stay in combos and stay close to all the bystanders. If there happens not to be jumps or such just keep doing manuals and do multiple combos near the bystanders. when you dont come across anyone for a while just go back to te checkpoint or another one in the same area and start to work down the hill.
Tips
+ If theres no jumps around you just do combos while in manual with buttons such as "xx" or "bb".
+ If your missing some bystanders and cnt find them sometimes they will be hiding either behind the checkpoint a bit, near the bottom near a cabbin, or havent responded yet which mean you have to just keep going to checkpoints.
+ Dont bail on a trick near these people, Just land it and start the next trick.
Any Questions, Just send me a message.
GT: xGodDogx