There are so many fun things to do in and around Canberra, that you'll want to stay longer just to try them all. Everyone knows about Parliment House and the National Gallery, but did you know that Canberra is just 2.5 hours away from the Thredbo ski fields? Floriade (in Sept-Oct) is spectacular and draws over 400,000 visitors each year.
It has been noticed that the price of electricity in Canberra is significantly less than in NSW. There are several 'Energy Switch' comparison sites available now, that will hopefully drive down power bills for the rest of us who are not so fortunate to live in the same area as our policy makers.