The East Rim Drive at Crater Lake National Park will be closed to car traffic tomorrow, September 20, 2014 and also September 27, 2014 from 7 am to 5 pm. The Park Service had a similar car free day last June and plans to repeat in future years - especially the third and fourth Saturdays in September. The idea is to encourage bicyclists and pedestrians to explore the area. This is one of the most scenic rides in the world and that much more enjoyable without car traffic!
The route is a 24 mile section of the paved road from Park Headquarters at Munson Valley to the north entrance. Be aware that there are some good grades involved and you are at, round about, 7,000 feet elevation. There is parking at the north entrance and at Park Headquarters as well as a parking lot just south of Park HQ. These will fill up early, but if you are up to it, you can park elsewhere and bike farther to get to the rim road.
You can bike this out and back starting at either the north entrance or Park HQ. It would also make a great one-way trip if you have a driver that wants to explore the West Side Road and meet you at your destination.
Find details here: http://www.nps.gov/crla/planyourvisit/vehicle-free-days-on-east-rim-drive.htm