How can I plan my visit to Hong kong during 21 feb to 26 feb 2015?

It would be during peak season, so you'd better book hotel in advance and Tsim Sha Tsui area shall be a good choice. Here is my general suggestion for your travel:
Feb. 21: check in hotel and roam around Tsim Sha Tsui
Feb. 22: go to Disneyland Resort in the early morning in case of crowds. After that, head for Ngong Ping 360 for fun.
Feb. 23: queue up for the peak tram early to the peak first, where you can enjoy Madama Tsussauds, Peak Tower etc. Afterwards, go down and have fun near Central
Feb. 24: Go to Ocean Park and then Causeway Bay. At night, go to Temple Street Night Market.
Feb. 25-26: Have a short visit in Macau.
May help!