Crowne Plaza Hong Kong Causeway Bay Hotel is now offering special package when you book minimum 2 nights stay. You can get 2 adult day-time tickets to Ocean Park (Worth HK$640) and free daily breakfast on your stay.
Booking Period: Now – 31 Dec 2014
Travel Period: Now – 31 Dec 2014
You can access the hotel home page here:
http://www.ihg.com/crowneplaza/hotels/us/en/hong-kong/hkglr/hoteldetail
I have tried to book 2 nights in Crowne Plaza and the “Oh my Ocean Park” rate is HK$2,410 per night. The “Advance booking with breakfast” rate is just HK$2,110 per night and they are both refundable and include breakfast. 
My conclusion
Hong Kong Ocean Park ticket is $320 per adult.If you added the ticket cost in the room rate, the “Oh my Ocean Park” rate is actually saved you HK$40 only. Therefore, make sure you confirm you are going to visit Ocean Park if you book with this rate.
Ocean Park Ticket Information:
http://www.oceanpark.com.hk/html/en/buy-and-book/
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