Pros: Varied terrain, excellent bike lanes.
Cons: Altitude, snow.

The latest NAHBS (North American Handmade Bicycle Show) was held in Denver in February, a fitting honor for a city that combines bike-friendly infrastructure with nearby mountains for off-road fun. And with everything from beginner courses to centuries offered on the BikeDenver site, every skill level is provided for. BYOO (bring your own oxygen).