The Gold Coast population is currently about 500,000 (440k in 2001, compared to 1.6M in Brisbane, & 4M in Sydney in 2001)
It covers about 50 suburbs, listed
here, and is the second fastest growing City in Australia.
As to its physical size, it is quoted as having a 70 kilometre coastline.
Distance from Brisbane CBD to the Surfers area of the Gold Coast is about a 1 hour drive.