? Cooktown to Cairns coast road

Yes it is walkable & yes Cape Trib has a good campground.
If you are walking down there are plenty of places to camp, both commercial, National Park & just in the bush.
That's a big walk for 1 day Terra. Have to be close to 100 k.

The NP at Cape Tribulation is a pre book on the net, only has 9 camp spots at $5.15 pp right on the beach in the rainfroest, nice spot.

hope you find your marbles !!!

September should be a good time , i walked from Bloomfield to Cape Trib in 1979 , it took me about 8 hours and i only saw 1 other person walking the other way and that was only because the mango festival was on no cars , bit different these days i'm sure , we free camped at Noah beach back then , last time i was there in 1993 it had all changed yuppy type caravan park at Cape Trib and basic camp at Noah beach but yeah i reckon you could free camp between Cape Trib and Bloomfield especially walking, watch for crocs between Bloomfield and Cooktown i cant really comment because i came down the road through Helenvale and Rossville so i'm not sure of the walking track , should be fantastic though , i remember coming across a nest of blue butterflies at one point , hundreds of them ,it was a life experience . Good luck and have fun , i'm actually heading that way myself but more likely in June /July .