Ctrip Black Diamond offers seasonal scenic area tickets, making admission to the park incredibly smooth. There are only three key shows in the entire park, one per day at 11:00 AM, 1:00 PM, and 3:00 PM. Therefore, you must arrive by 10:00 AM at the latest. Although the park closes at 5:30 PM, many rides end after 4:00 PM, so be sure not to buy tickets for the afternoon show.
Food within the park is quite expensive. I had a hot dog combo at the Mermaid Restaurant, which was probably the cheapest of the several restaurants at 55 yuan. The cheapest combo at other restaurants was 78 yuan.
The Whale Roller Coaster is a must-ride; it's a non-straining, bouncing roller coaster. Although it's not very high, many people say it's scary, but once you get past the first bend, it's not that scary. The ride lasts a total of 70 seconds.
Haichang Ocean Park is about 2 kilometers from the subway station, so you can take a taxi or bus. If you're not using Black Diamond benefits, you can also book Haichang's own hotel, which offers unlimited admission to the park for two days.