Greyhound Lines (1055 19th St., LoDo. 800/231-2222. www.greyhound.com).
In downtown Denver, free shuttle-bus service operates about every 10 minutes until 1 AM, running the length of the 16th Street Mall (which bisects downtown) and stopping at two-block intervals. If you plan to spend much time outside downtown, a car is advised, although Denver has one of the best city bus systems in the country and taxis are available.
The region's public bus service, RTD, is comprehensive, with routes throughout the metropolitan area. The service also links Denver to outlying towns such as Boulder, Longmont, and Nederland. You can buy bus tokens at grocery stores or pay with exact change on the bus. Fares vary according to time and zone. Within the city limits, buses cost $1.75.
RTD (303/299-6000 or 800/366-7433. www.rtd-denver.com).