You can take bus E21 from the airport to Tung Choi Street, Argyle Street, the hotel is just at the oppsite side of the bus stop. When back to the hotel, you can walk to Bute Street, Nathan Road to take bus E21. The bus fare is HKD14.
From Mongkok to Madame Tussauds, you can take MTR to Central and then take bus 1 to the peak. You will see Madame Tussauds on the peak. It costs about HKD18.5 by the metro and bus. The entrance fee is HKD160/HKD90.
From the peak to Disneyland, you can back to Central, then go to Hong Kong station to take Tung Chung line to Sunny Bay and take Disneyland resort there. It costs about HKD22. The entrance fee is about HKD350.