planning for more places of attractions in Hong Kong

Planning to visit hk in april.so far day 1-visit disneyland,day 2-ocean park.day 3-victoria peak,wax museum /kowloon park, avenue of stars,day 4-ladies market,shopping.im not sure bout the ngo ping 360,seems expensive.any other places to visit in hk?and is it true,buying entrance ticket online is cheaper?