The Charm City Circulator runs five free bus routes across central Baltimore every 10 to 20 minutes. It connects Inner Harbor, Federal Hill, Mount Vernon, Harbor East, and the university campuses — the single best tool for hopping between neighborhoods without a car. The free Harbor Connector water taxi links Fells Point, Locust Point, Canton, Pier 5 (near the Aquarium), and Federal Hill on weekday peak hours. For paid leisure cruises and broader harbor access, Baltimore Water Taxi offers hop-on, hop-off service. BWI Airport is the most convenient airport for most visitors. The Light RailLink provides a direct, inexpensive connection from BWI to downtown Baltimore in roughly 30 minutes. The