JFE, if you plan on coming back south via the coast, head inland at Rockhampton and go via the Burnett hwy. The coast road south of Rocky is atrocious and full of road works. Safe travels.
If you take the Burnett hwy at Rocky, you can rejoin the coast road at Gympie or a bit further down near Bribie Island. its not that much difference in KM’s I shit you not, from around Gladstone all the way to Gympie is crap.