If you're going to "Do" Downieville, get a ride to the top. Yuba Expeditions offer daily shuttles and have the demo bikes and supplies you'll need.
A host of outdoors activities are available near this historic and scenic location, including hiking, climbing, mountain biking, and cycling.
Hiking from Donner Pass to Squaw Valley via the Pacific Crest Trail is a 14.2 mile lightly trafficked point-to-point trail that features beautiful wildflowers and is rated as moderate. The trail offers a number of activity options and is accessible year-round. Dogs are also able to use this trail but must be kept on leash.