Bring sufficient water when going for walks. Temperature and weather can change drastically, and should be prepared to be caught in a thunderstorm when just minutes ago it was bright and sunny.
Bring raincoats, energy bars and some candy on the longer walks. Anything can happen and you find yourself stranded. Bring basic first aid equipment - some of the walks in Freycinet involve climbing, and a sprained ankle can cause you to be stranded in the middle of nowhere. However you should be more confident to attempt the Wineglass bay lookout walk, which is well formed, signposted, and popular.
On the road, observe speed limits. 50km/h on all Tasmanian streets, and 100km/h on highways unless otherwise signed. Fines are imposed if motorists fail to observe speed limits.
Do not provoke animals, and remember not to feed them.
fees/permits
You need a permit for all of Tasmania's National Parks. They can be bought at the national park visitor centre at the park entrance, and there are several different options from a day pass for just this one national park to a pass that is valid for an entire year and includes all National Parks of Tasmania.
The fees are shown below currency is in Australian dollar:
Daily Pass: up to 24 hoursPer vehicle up to 8 people: $22Per person: $11
Holiday Pass: Up to 8 weeksPer Vehicle up to 8 people :$56Per Person :$28