It appears that mountain bikers like those fast flowing descents far too much to bother to stop and take photos. Lucky bushwalkers do take the time and a few photos along the way. 🙂
It turns out that some of the rides that canberra.bike will recommend are also popular bushwalking areas. A good example is Mount Rob Roy, where the loop route I recommended is also a popular bushwalk. Australian Hiker has an excellent review of this walk and shows nicely the reasons for going there.