One of the best exhibits at the New England Aquarium is free. It's the huge outdoor seal tank located before you enter the building. You can walk up, stand right next to a seal, and see what the seal habitat is really like. Now the clever folks that care for seals strapped a cam on to the back of one of the animals. See what its like to play inside that tank!
Check out this video at Youtube of two baby seals playing in the snow. It's very cute! :)