Canberra aint got the action of Sydney. You'll have to readjust your expectations.
What Canberra does have though is empty roads compared to Sydney.. you can drive from anywhere to anywhere else in Canberra with no hassles and can often park in front of where you are going. traficc is much better than in Sydney.
The air is clean, the sky beautiful, parklands everywhere.
National parks are not far away, you can go for a day trip to the ski fields in winter. There is a lot of outdoorsy stuff you can do. Cycle ways are fairly safe and common compared to Sydney... riding into Civic on a Saturday morning and ordering a big fried breakfast at a cafe is always fun.
There is a lot to do in Canberra... it just requires a bit more searching to find it than in Sydney.