If Seaworld and Disneyland ever had a kid, it would result in Ocean Park. Built in 1977 and located on the south part of Hong Kong Island, Ocean Park is where the locals go when the tourists go to Disneyland Hong Kong. Ocean park had an authentic feel to it that wasn't over the top and reminded us a lot of Parc Asterix during our stay in Paris - except a heck of a lot more efficient. Ocean Park has two parts to it: The Summit and The Waterfront that are physically separated by a huge mountain in the middle. To travel between the two, there is a 10 minute gondola ride where you get awesome views of the South China Sea. On the summit, they have a Shamu-esque show and many standard adult rides. We spent most of the time though in the Jelly Fish exhibit, which boasts over 1000 jellyfish, the Chinese Sturgeon Pavilion, and watching the dolphin show in the main stadium. The Waterfront had way more rides for Chloe though and had the best Panda exhibit that I've seen. We finished the day going to the Grand Aquarium which is 4 stories high and had a 20 foot high tank on display. If given a choice to only see either Ocean Park or Disneyland HK - I'd highly recommend Ocean since Disney is never gonna be close to their American cousins and it'll give a unique theme park experience - complete with BBQ cuttlefish ;)
