They have an abundance of animals and alot to see. Alot of up and downs and passage ways through the trees, my boys had a blast exploring. Walking the zoo is the best route. The bus tour is just an overview. I would pack a lunch or snack and spend the afternoon there.

this place is great for the kids. It is one of the best children's museum I have ever been too. The best thing is that Friday nights after 5pm its only $1. It is also open the day after t-giving. Its a great place to visit in the city of Boston. They have a play space for infants/toddlers as well.