Things to do in Baltimore while pregnant besides the aquarium?

I am going to Baltimore this weekend for a last get-away before the baby comes. What is there to do besides go to the aquarium? I wanted to do the duck tour but it is closed for the winter. Any suggestions are great. Thanks.

treat yourself to a good restaurant, or go to DC

The Hippodrome Theater is one suggestion. The Sports Museum near Camden Yards is another suggestion.

Both places are walking distance from the University of Maryland Medical Center in case one goes into labor.