Ok, well if you want to settle in and relax, id suggest driving about 1/2hr from Devonport to Narantapu NP and camp at bakers point, some fantastic camping there. Modern drop toilets and water(not drinkable), beach side camping.
Up around the nth east coast, some fantatic camping around croppies point(waterhouse conservation reserve, free camping with drop loo's, no water), petal point, mt william NP has about 4 nice camp grounds, policemans point, bay of fires, dora point, dianas basin, lagoon beach, mayfield bay to name a few great spots along the coast.
Bridport, st helens, coles bay, bicheno, swansea, port arthur, bruny island etc. for paid camping gee, most places are great.
Id suggest getting a NP pass from the gift shop on the spirit, saves trying to get on once of travelling.
West coast is great, maybe unhook van at strahan and explore the coast granville hbr and trial hbr, then theres the inland lakes, central plateu .
If you come through Chudleigh, call into the workshop on the corner( only one corner in chudleigh
) and say gday. Also free camping at the cricket ground here or nice caravan park at Mole Creek