What are some fun things to do in Hong Kong?

Shopping
Ocean Park
A walk from Sok Kwu Wan to Yung Shue Wan (Lamma)
Disney
Shopping
Ngon Ping 360
Lan Kwai Fong
Shopping
Day trips to China
The water front
Shopping
Chinese food
Hiking in Saikung
Shopping

Did I mention shopping?

Shopping in Mongkok
Ocean Park
Go to the Peak and check out the view
Tsim Sha Shui to ride the ferry to Central
Lantau Island for the big Buddha
EAT EAT EAT, any restaurent for dim sum
Go to Cheung Chau for Seafood
And most of all, explore!

Go visit the aerospace museum in Terminal 2. Or watch a 4D movie, it's cheap at $90 HKD roughly, but it lasts 15 minutes T_T. You could also walk around Terminal 1 and 2. Apart from that, there isn't much else to do. You could take the Novotel Citygate shuttle to Citygate mall which is about 10 minutes away by car. From there, you could either go look around the mall or go on the cable car (Ngong ping 360) to the huge Buddha statue. And one more thing, do not go into the arcade it's like $2 per game..

Go and see the bird market - its quirky. Also Aberdeen where you can eat on a boat and the night market.

what kinda stuff are you after? If you like to party you must visit Lan kwai Fong in Central. It's where its at.

Shopping go to Times Square in Causeway bay or IFC Mall in Central. Actaully Hong Kong is like one huge shopping mall everywhere you go there are shops galore!

For touristy sight seeing go to Tsim Sha Tsui Harbour and soak in the view. Also go to the Peak and take the tram up there. Its in Central also. Its quite an experience and there are things to do in the mall up there too like a Ripleys believe it or not and bubba gump restaurant.

Check out the day and night markets in Mong Kok. Take the MTR (subway) there and get out at either exit D and follow the crowd! Not recommended if you are claustrophobic, but a definite fun experience.
Also check out the night market in Jordan. You can go to Temple street and get someone to read your fortune (palm, face, etc).

If you are interested in seeing greenery you can go to the reservoir in aberdeen.

As for other islands in HK, one tourist must see is on Lantau Island, same island that the airport is on. That tourist site is the Big Buddha. You can look it up I am not sure whether its like the biggest Buddha in like south east asia or something. It's pretty impressive. You can also take the cable car up there from Ngong Ping station (MTR). Its an amazing view from up there looking down on the HK islands!!

Hope you enjoy your stay there. For more info and ideas visit the customer site for www.mtr.com.hk but I think it's down at the moment.

Eat at any dim sum restaurent
Shopping at Mongkok, Tsim Sha Tsui
Go to the Peak
Ocean Park
Avenue of Star for the light show
Go to the beach in Southern HK Island
The big Buddha at Lautau Island
Causeway Bay, Central and Wan Chai

Many foodcourts can be found in some big mall in HK Island and Kowloon. You can have an international meal there. Besides, Victoria peak is a popular spot. You can look at the view of HK Island & Kowloon Penisula.Lan Kwai Fong is an excellent place. There are lots of bars.
Hope you can have a great vocation.