To your questhouse in Kowloon from the airport? The cheapest way should be airport bus. I have no idea where your guesthouse is located specifically. I think Bus A21 would take you to the place or nearby. It is about 40-50 minutes'd ride, 33HKD per person. At the same day, you can get to Mongkok for shopping. Lady's Street is in Mongkok. I can not tell you the time and cost you have to spend to those places you mentioned because I donot know where you hotel is located. Say you stay close to TST MTR Station. It costs 4HKD by mtr to Central within ten minutes, then you can get to Victoria Peak, Wax Museum. Avenue of Stars is within walking distance from TST. Get off at Admiralty, the MTR stop just before Central, there is bus 629 to Ocean Park, 10.6HKD for less than 30 minutes. It takes nearly 40 minutes by MTR to Nging Ping 360 station at Tung Chung and 40 minutes to Disneyland. The costs is nearly 20HKD, exclude the cable car cost to Big Buddha.