its a long drive but there are lots of nice places to go where you cant go when you take a bus... pm me some questions of what you want to see and do and ill try and help
never caught the train...
places to go between brisbane and cairns...
brisbane city has nothing exciting but stradbroke island and moreton island are great
sunshine coast ~ australia zoo (its worth it), noosa is nice (pretty trendy but nice) and Fraser Island is a must (I love Fraser)
after the sunshine coast and fraser island, there are a ton of small towns some a nice some are not worth stopping in... (the highway doesn't always run along the coast ... and you'll get bored of seeing open Eucalypt country and dead kangaroos) then you get to Proserpine and you hang a right and head to Airlee beach and go to the Whitsundays. The whitsudays is great.. best thing to do there is to charter a yacht... if thats not in your budget, you can still visit some of the islands... (airlee is a backpacker town lots of bars and parties...
northwards there are more small towns ,bowen, ayr, townsville (it sucks, but magnetic island is just off the coast), ingham, tully (great for whitewater rafting), mission beach (great place to jump out of a plane) , 0between tully and mission there is an Island called Hinchinbrook you probably wont be able to get on it but its beautiful, innisfail then cairns