i am staying only for 2 days in hongkong

Here is my suggestion:
Day 1: in the morning take mtr to Ngong Ping 360, there you will spend half a day. When you come back in the evening, get off at Central or Admiralty, where you can watch the Symphony of Lights from 20:00 to 20:14. After that, you just go back to the hotel.
Day 2: in the first half of the day, you can go to the Victoria Peak, the second half of the day you can go shopping in the ladies market.

Hope this would be helpful.