Easiest way from Brisvegas is up to Cabulture and then out along the D'Agular Highway, through Kilcoy, then on towards Moore. Turn right just before you get to Moore and head out to Linville. Check out the map to get to Moore
Map
http://www.qldastrofest.org.au/html/map.htm
Then image 1 to get to Linville and then image 2 to get to Duckadang. In image 2 Linville is just off the map at the center bottom. Duckadang is on Avoca Esplanade at the dogleg after the river crossing