I decided to include some good viewing spots and places with cheap camping in this thread.
The Mt Surprise Qld airstrip is dark and has a good northern horizon. The only problem was wind when I was there.
I observed from near the airport hanger and stayed in the excellent caravan park nearby.
http://www.bedrockvillage.com.au/
Mt Surprise is 290 km SW of Cairns and 450 km NW of Townsville.
A Google image is attached. The airport's latitude is 18.1 degrees south and its elevation is 440m.