Check Maryland Transit Administration (MTA; www.mtamaryland.com) for all schedules and fares.
Baltimore Water Taxi (410-563-3901; Inner Harbor; adult/child under 11 $8/4) Lands at all harborside attractions and neighborhoods.
Light Rail (410-539-5000; tickets $1.60) From BWI to Lexington Market and Penn Station.
MARC trains (800-325-7245) Hourly between Penn Station and BWI on weekdays for $4.
SuperShuttle (800-258-3826; www.supershuttle.com) BWI-van service to the Inner Harbor for $21.