Kudos to the Mile High City for implementing the first bike-sharing program in the United States. Comparable to Paris, Amsterdam, and Montreal, you can pick up a shiny new red 3-speed Trek bike at any of the 40 stations around town and drop them off at another station. A 24-hour membership is $5 while a yearly membership will set you back $65. Simply pick up the bike at say the Colorado Convention Center and drop it off near the Denver Art Museum. From the Denver Art Museum, grab another bike and cruise to your hotel. Starting in June, the bikes will be equipped with RFID chips and computers to track mileage, calories burned, and carbon offsets. Visit Active Travels for more adventures.