We visited the aquarium and were shocked to spend about $38 on parking! This was for a visit on a Sunday from about 3 to 8 p.m. Are there any good deals on parking near the aquarium? As an alternative, can I take MARC from Union Station DC to Camden Yards and walk? Is it safe? I would be alone (I'm a woman) with a 5-year-old and a baby. Is this okay or a bad idea? I know there is bad crime in parts of Baltimore.