We went to the National Aquarium on the 26th which was great because it was basically deserted. Maybe it was because most people wanted to play with new toys at home, or maybe because it was raining and you have to walk outside to get there, or maybe it's because all the walkways around the Inner Harbour were flooded (to the point of walking in the grass). Who knows?!
But we had a blast! And it was very nice because it was not super crowded! We enjoyed the Jellyfish.