Car alternatives when going to UNC events

For those of us who only visit UNC on occasion, what is the full range of options for minimizing the use of a car to get there? Has anyone put this together? Other than walking and a bus, are there other options? Is there a guide anywher on how we can all "use" UNC in a more environmentally friendly way? Ditto for downtown Chapel Hill? And for Carrboro, Hillsborough and Pittsboro as well.....