I will stay in Eaton Hotel Hong Kong. How do I get to Disneyland via MTR?

Hello, Ryan. You can walk from the hotel to Jordan MTR Station to take Tusen Wan line and get off at Lai King. There transfer to Tung Chung Line to Sunny Bay, where you can easily take Disneyland Line to the resort directly. It takes around 40min and costs 22.5HKD per person.

Thanks for your reply Henry. If I intend to finish the fireworks which would be late at night, will I be able to take the MTR back to the city/eaton hotel?

Yes, of course. The fireworks ends before 21:00. The rail line operates till 00:40 from the resort. You can surely catch it to return the hotel.