Mt Wilhelm Traverse
Another good hike that I can do, as I have discovered, is to climb from the Western Highlands side of Mt Wilhelm to the top and then down into the Simbu side to the lakes and huts from where we went up.
I have found a description of this on the web here. As you can see the website is absolutley horrible to look at (whoever put it together should be shot), but at least it has good information and pictures.