Enjoy the Spirit of Baltimore, Baltimore's original local day cruise line. They offer lively lunch and dinner cruises. The Inner Harbor Spirit offers 60-minute scenic narrated sightseeing tours of the historic Inner Harbor. The boats are fully-enclosed and climate-controlled.
Watermark Cruises offers short 45-minute narrated harbor cruises in Baltimore. See iconic Domino Sugar sign, Fort McHenry and the Key Bridge. They depart frequently throughout the day. There is also a 1-hour "city lights" cruise on Saturday evening. See the skyline lit up.
The Baltimore Water Taxis are a wonderful transportation system and harbor cruise around the Inner Harbor. Three to fourteen boats operate every day, depending on the season. They cover several routes and stop at all the attractions: the aquarium, Harbor Place, Fells Point, Fort McHenry, etc.
The Black-Eyed Susan Boat is Baltimore's only paddlewheel dinner boat. They offer a few cruises open to the public -- murder mystery dinner cruises and harbor lunch cruises.