Talking about the Brighton-Redcliffe area, I live at Bracken Ridge and have found along the water front at the park on the Brisbane side of the Hornibrook to be very good.
Coming along the Deagon Deviation, turn right at the lights before the bridge, go past the park on your left and take the first left toward the water. At the end of the street there is a large car park, plenty of houses nearby (for security), but it is reasonably dark enough and has a good view for 360 degrees above 10 degrees on the house side...but absolutley down to the horizon on the ocean side. Another good thing is I can park the car, open the back, pull out the scope, and set up within 10m. It means I can leave the laptop running in the back of the car and still refer to it without worrying about it sprouting legs.
Oh, take plenty of mozzie rep - the other night the little buggers were savage and I just managed to view Saturn before they carried me away, multiple layers of "Rid" and all. Good thing is it's not usually like that there.
A good site, close to town.