It's on Raubers Rd, Nudgee. Officially named the Mick Doohan Motorcycle Complex.
Head north from the Gateway Bridge and it's only a few Kliks on the left.
There's a well posted exit for the Airport and I think you can take that, but I'm a creature of habit and always take the LEFT exit AFTER the Airport exit.
But hey, the Navman has done for driving what 'No more Gaps' has done for Carpenters...a good job and spot on every time!