Don,
Mongkok, is towards the western side of Kowloon. Plenty of shops and close to several MTR stations. It's around 20 to 30 minutes from the new airport, and close to all the hot spots you would want. No where in HK is very far from anywhere. Check out the hotels on the net, Most hotels from 3 star up are more than adequate for your needs, you just need to check prices... There are some great day and also night markets around that area. I lived and worked in HK and not a million miles from Mongkok either, but alas that was a long time ago now, and i probably wouldn't recognise most of it now. What i can tell you, is that you can fill that one or two days up with absolutly no problem at all. Far too much going on in HK to tell all here, get on the net and see for yourself...haha!!
David....
PS....
The MTR (underground railway) goes to the airport, as well as everywhere else you would want to go in your 1 or 2 days, and it's a cheap mode of travel .... i should know, i helped build the thing!! ...hahaha!!