Recommended route:
Day 1: going to Disneyland, stay there till the firework show, after that take MTR to Jordan Station and go to Temple Street NIght Bazzar
Day 2: going to Ocean Park, in the after noon leave the ocean Park and head to the Peak, visit Madame Tussaudes and stay till night for the night view of Hong Kong.
Day3: Take MTR to Tung Chung, there you can firstly get to Ngong Ping 360 Cable Car and go to Ngong Ping and see the Giant Buddha, after that, you can get down the hill and shopping at Citygate Outlets Mall at Tung Chung. Take MTR to Tsim Sha Tsui and arrive at Avenue of Stars at around 07:30, there wait and see the Symphony of Lights show. After that go back to your hotel and take a rest.