Day1: when you arrive at the airport, please take a cab driving to the Big Buddha directly. However, I don't think it is a good idea to climb to the Buddha with your luggages. Well, after that, you could take a cab to the hotel in Mong Kok, or taking the metro to Mong Kok. At night, you could take the metro or a bus to Tsim Sha Tsui and then walk to the water frontier where the Avenue of Star and the performance is.
Day 2: Please take the metro from Mong Kok and get off at Admiralty station, at the Exit C of which you could take the bus 629 to the Ocean Park directly.

In the afternoon, you could take the bus 629 back to Central, from where you could walk to the Peak Tram Terminal and then take the tram to the Peak. Finally, please take the same metro back to the hotel

Day3: please take the metro to Lai King station and then transfer to the Tung Chung Line to Sunny Bay station. Here, you could transfer to the Disneyland Resort Line to the park directly.

Day4: please take a cab driving to the China Hong Kong City Ferry Terminal, not far from the hotel. Here, you could take a ferry to Macau.