The museum of natural history made the most sense because Tman is fascinated by animals right now. Whenever he recites the alphabet it's all about the animals, it always goes something like A is for ants, L is for Lion, T is for Tiger, and so on. He is also into dinosaurs and what better place for this.
At the entrance of the Dinosaur exhibit
We went down to the water area and saw a giant whale, Tman was fascinated. W is for whale :)