Can I ride off course in Mountain Bike maps?

How do I exit from an activity? How do I exit the game? What are these screens that pop up between activities in a playlist? Can I change the camera view in an activity? How can I tell who is in the game with me? What does the Gap mean in the Nearby Riders List? Why am I crashing? What is drafting? How does drafting work? Does the game have bots? Why does my avatar sometimes look like a ghost? and 9 more ...