Department of Conservation & Recreation. For other path locations, consult the Department of Conservation & Recreation Web site. www.mass.gov/dcr.
Massachusetts Bicycle Coalition. This advocacy group works to improve conditions for area cyclists, has information on organized rides, and sells good bike maps of Boston and the state. Thanks to MassBike's lobbying efforts, the MBTA now allows bicycles on subway and commuter-rail trains during nonpeak hours. 171 Milk St., Suite 33, Downtown, Boston, MA, 02109. 617/542–2453. www.massbike.org.
Dr. Paul Dudley White Bike Path. This 17-mile long path follows both banks of the Charles River as it winds from Watertown Square to the Museum of Science. Watertown, MA.
Back Bay Bicycles. Road bikes rent here for $65 per day (weekly rates are also available)—cash only. 362 Commonwealth Ave., Back Bay, Boston, MA, 02115. 617/247–2336. www.backbaybicycles.com.
Community Bicycle Supply. This South End place rents cycles from April through October. 496 Tremont St., at E. Berkeley St., South End, Boston, MA, 02116. 617/542–8623. www.communitybicycle.com. Back Back.
Urban AdvenTours. A variety of themed excursions run throughout Boston and Cambridge, with most covering about 10 to 12 miles. They leave from Urban AdvenTours Atlantic Avenue headquarters and are offered almost every day; in winter, the tours depend on the weather—call to confirm. The main tours cost $50 per person, and tickets are available for purchase through the website. You bring the adrenaline, Urban AdvenTours bring the bikes, helmets, and water. 103 Atlantic Ave., Downtown, Boston, MA, 02110. 617/670–0637. www.urbanadventours.com. Aquarium Station.