How about returning from Disneyland to ROH, Sa Po Road, Hongkong? The same with Ocean Park.

Oh, you must refer to Regal Oriental Hotel, right?
1. From Disneyland to the hotel, take Disneyland Resort Line, get off at Sunny Bay Station. Then transfer to Tung Chung Line to Lai King Station and take Tsuen Wan Line to Mei Foo Station, Exit A. After that, take public bus no. 6D at Mei Foo Bus Terminus to the hotel station directly.

2. From Ocean Park to the hotel, take public bus no. 107 at Aberdeen Tunnel Toll Plaza, and get to Regal Oriental Hotel, Prince Edward Road East. After arriving, you can see the hotel directly. :-)

3. The One-Day Ticket of Disneyland is 499 HKD per adult. The opening hours are 10:00 to 21:00 on weekends and 10:30 to 21:00 on weekdays.

4. The entrance ticket of the ocean park is 320 HKD per adult. And the opening hours are 10:00 to 18:30.

5. Generally speaking, there are enough tickets. You can buy them when you arriving at. So don't worry. Have fun!