Found this on the Rainbow Beach Website.....
Four Wheel Driving
Roads through the park allow visitors to explore Cooloola's magnificent natural features. Take time to plan your trip and enjoy the area's highlights. Cooloola conditions report.
Teewah Beach is suitable for 4WD vehicles only. The 40km stretch of beach provides access to the Teewah Beach camping zone, Freshwater campground and Double Island Point.
Cooloola Way is suitable for 4WD vehicles only. The 32km dirt road connects Rainbow Beach Roadand the Kin Kin–Wolvi Road. It passes through Cooloola's western catchment, a low area of wallum banksia which flowers prolifically in spring, and taller forests with scenic views east over the Cooloola sandmass. This road has access points to parts of the 48km Cooloola Wilderness Trail — a wonderful walk in spring.
Freshwater Road is a rough 19km track that passes through Cooloola's diverse plant communities. From the woodlands of the west, 2WD vehicles can drive 3km to the rainforest around Bymien picnic area. The road winds on, suitable for 4WD only, through tall blackbutt forest, scribbly gum woodland and coastal banksia communities, and then continues to the Freshwater campground and day-use area or 500m further to Teewah Beach.
Kings Bore Track off Rainbow Beach Road(10km south of Rainbow Beach) passes through open forest, with stands of blackbutt, tallowwood and pockets of rainforest. The track continues to Teewah Beach as a steep one-way track that requires careful driving. The entire trip totals 18km one-way (allow one hour). A circuit drive is possible by taking a northern branch off Kings Bore Track (circuit totals 40km — see map). This is a remote, unsigned track and visitors should be self-sufficient and carry sufficient vehicle recovery gear.
See:
http://www.rainbow-beach.org/content/view/120/266/