The first day, you can go to see the Big Buddha after checking in for the hotel; have a good rest the night and Disneyland the 2nd day, you may need one whole day there; 3rd, the peak. You'll still have another days in Hongkong, manby you can choose some other interseting places from Hongkong Tours(https://www.travelchinaguide.com/package/hongkong/) . I found these itinearies well-made. Have fun~