Hong Kong is said to be the bunny slopes for Asia beginners. It is very developed city with some great features and tasty food. I visited HK twice for visa runs from Mainland China. Each time I went, I was in need of some pizza, English movies and books, and a spot of shopping. I had been working in very rural areas, so Hong Kong felt like such a treat!
If you are interested in architecture, Hong Kong is the place for you. You can see a mix of temples with traditional Chinese features next to huge, shiny skyscrapers. The mixture of old and new is really amazing.
Mmmmm I love Asian food. I'd suggest trying some Dim Sum in the morning -- it is a great way to taste several types of food without filling up. There are also these amazing baked (or fried?) sesame balls, which I would suggest not missing. During my trip to HK, I had a hankering for pizza, and luckily I was able to find numerous pizza spots, unfortunately I can't remember the name of the restaurant I enjoyed the most.
I was living in Mainland China during my two visits to HK. Instead of taking an expensive flight directly into HK's airport I flew to Shenzhen and took a train from SZ to HK. You can also take a bus from SZ airport into HK and get dropped off at popular locations throughout the city. Both options were easy and inexpensive. Packing light for the bus/train option is imperative though as you may end up schlepping your luggage through the city's public transportation.
Have you been to HK? What is your favorite spot?