A. There are shuttle buses between the hotel and HKIA. The bus leaves from the airport every 30 mminutes. The ticket fare is HK$110 per person, including 2 pieces of luggage. You may go to "Parklane Limousine & Airport Shuttle Counter" located at Counter A16 at Exit A and Counter B16 at Exit B on Arrival Hall at the Hong Kong International Airport to buy the ticket. You may also take bus No. A21 from the airport to Prudential Centre, Nathan Road, and then walk along Austin Road for about 5 minutes, you will reach the hotel.
B. BP International is about 3 minutes' walking from Jordan MTR station, so you can take HK MTR tsuen wan line from Jordan to Lai King, transfer to tung chung line to sunny bay to take disneyland resort line to disneyland. It cost HKD24 for the MTR, and the entrance fee of disneyland is HKD350 for adults, HKD250 for children between 3-11 years old, HKD170 for senior of 65-years old and above, and free for children under 3 years old.
C. Wax museum is just located on the victoria peak, so you can take tsuen wan line from jordan to central to take bus no. 15 to there.
D. Take tsuen wan line from jordan to admiralty, transfer to bus no. 629 to Ocean park. I think taxi is more convenient for you, considering you are taking 2 kids. But it may cost too much by taxi.