Well there's 2 decent ones that I can think of, Toowong and Fairfield (I think it's fairfield anyway)

Annerley is closer to the city and has a view to the mountains, and Boggo Road Goal is just down the road too, well what's left of it since they turned it into apartments.

Toowong also has Mt Cootha lookout above it. A great spot to watch the sun come up, especially if you have a long lens for views of the city. There is also a couple of waterfalls and walks up there.