Every hour there's a bus from Nederland to Boulder and vice versa. "Ned" is one of our favorite towns, home to great coffee, some nice cafes, and smack in the mountains for optimal outdoorsy activities. The Eldora ski area is likely not yet open, but you can certainly hike around there, or if there's not yet snow on the ground, visit Tin Shed, rent a mountain bike, and rip some local trails directly from town.
Last time we checked, the bus is $3 and payable with exact change when you get on the bus. Pick it up from the downtown Boulder station on Walnut, it's a quaint and sinuous ride up Boulder Canyon, then brief 30 minute ride later, you're there. The Nederland Park-n-Ride is the closest to the action of sleepy, downtown Ned.