Department of Conservation & Recreation. For path locations, consult the Department of Conservation & Recreation website. 251 Causeway St., Downtown, Boston, Massachusetts, 02114. www.mass.gov/dcr.
Dr. Paul Dudley White Bike Path. This 18-mile-long path follows both banks of the Charles River as it winds from Watertown Square to the Museum of Science. Watertown, Massachusetts, 02472. www.mass.gov/eea/agencies/dcr/massparks/region-boston/recreation.html.
Back Bay Bicycles. Road bikes rent here for $45 per day (weekly rates are also available). City bikes rent for $35. 362 Commonwealth Ave., Back Bay, Boston, Massachusetts, 02115. 617/247–2336; www.papa-wheelies.com.
Community Bicycle Supply. This South End place rents cycles from April through October. The $25 daily rate also includes a helmet and lock. 496 Tremont St., at E. Berkeley St., South End, Boston, Massachusetts, 02116. 617/542–8623; www.communitybicycle.com.
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's Atlantic Avenue headquarters and are offered almost every day; in winter, the tours depend on the weather—call to confirm. The main tours start at $55 per person, and tickets are available for purchase through the website; bike, helmet, and water are all included. A variety of rental bikes are also available. 103 Atlantic Ave., Downtown, Boston, Massachusetts, 02110. 617/379–3590; www.urbanadventours.com.