The Namadgi National Park website of the ACT Environment, Planning and Sustainable Development Directorate, for short ACT Environment, has been updated. They have even provided a rather nice map and updated the walks page, too.
Namadgi National Park has not been mentioned much yet on canberra.bike. After the fires, it has remained closed. The northern and southern tips of the park are now opening again.
Mount Tennent, Honeysuckle Creek and Mount Rob Roy belong to the great hill climbs in the south. Mount Tennent, south of Tharwa, is usually walked but it can be run. Honeysuckle Creek is a popular road ride (the road is currently closed), and Mount Rob Roy a gravel ascent on Banks Steep Track management trail.
Leave Canberra and follow the Tharwa Drive south to the Tharwa Bridge. Mount Rob Roy is to the east and Mount Tennent directly ahead. Continue to the Namadgi National Park and Visitors Centre. The Namadgi National Park is currently closed but it is a pretty trip to Apollo Road. There is no bushfire damage and, after the rains, it is green and lush.
Tharwa is a great idea for a day out and there is a lot to see in a small area. You could consider riding there south through Canberra, or if you are keen then try the loop ride from Stromlo Forest Park south through the suburbs to Tharwa, where you cross the Murrumbidgee River and return to Stromlo Forest Park on the other side of the river via Tidbinbilla Nature Reserve and Cotter.