Day 1: from the airport, you could take the bus A11 to the Fortree Hill directly. And then, you could take a city-bus or metro to Repulse Bay and Central easily.
Day2: please take the metro to Sha Tin, where you could find the New Town Plaza. The Snoopy World is located here. After that you could take the metro back to Tsim Sha Tsui, where the Space Musuem and the Avenue of Stars located.
Day 3: Please take bus or metro to Central firstly and then walk to the Pier No.2, where you could take a ferry to the Noah's Ark directly. However, I don't think you will have enough time to visit hte Buddah on the same day.
Day4, you could visit the Buddha and Disneyland today. On the early morning, please take the metro to Tung Chung and then transfer to bus 23 or the cable car to the Buddha. After that, you could take a taxi to Disneyland quickly. At night, you could take the bus R11 back to the Fortress Hill from Disneyland directly.
Day 5: there is no direct bus could be used. So, the easiest way is that you take a bus or metro to Admiralty, where you could take the bus 629 to the Ocean Park directly.

thank you so much mr. hank.. on what day can you recommend us to go the peak? and sir, do you know any public bath house that has spa in hk? tnx again