Camden aquarium was amazing! The hippo exhibit itself is worth the trip! Baltimore is nice, been there a few times, but honestly, I think Camden ith it's recently redone aquarium is hands down loads better than Baltimore at this time.
I took my daughter last year, she was 18 months, and she had a blast!!! IT's big and open, so not very crowded, gave her a chance to really walk around and enjoy things without causing me to panic that she was going to get lost.
again, the hippos make this an aquarium you have to go to!! My adult sisters are hoping we can take the family again soon, since they weren't there when we went last year.