The zoo and aquarium were great. Keely always makes sure I get to see these things when we travel. Best Zoo: Singapore. Worst Zoo: London (ties with the Oregon Zoo which didn't even have tigers, lions or giraffes the last time I was there.) Best Aquarium: Singapore (says Keely - I didn't get to see it). Worst Aquarium: the one at the London Zoo. Their new aquarium across the Thames is pretty good, though.