Part of the adventure of going to the aquarium, is taking the train. The younger two especially love this part of the adventure.
My oldest has gotten smart in his old age. He brought a book! You can see the seriousness he already has, though I hope he has a lot more of the smiles when he grows up. I sometimes think he worries too much.
Going home, they did quite well after a long day. My daughter decided to lie down (thankfully midday trains are quite empty) while she had her snack.
My son still loved the view, though he started counting the stations until we got home.