There is only one road into the park.
Opposite to that sign (below) one can come by boat from Port Sorell which is on the other side of the beach, we used to do this for several years on a Sunday years ago to water ski in this area. Those times there was no fee and no road into Bakers Beach.
Below is a Pademelon which is a small marsupial, they can be distinguished from wallies by their shorter, thicker, and sparsely haired tail.
Above is a Parrot taken from a distance out the vehicle's window so it's not that clear.
Wallabies are just everywhere, they are much smaller than kangaroos. If you look hard in the below photo and enlarge it you will see them dotted along the side of the right hand side of the road and in the bushes.
Above photo is part of the camping area which is low cost, no showers in this area or power, toilets are available. However within the National Park in one area close to the Information Centre there is a campsite with power, toilets and showers for a low cost.
Both photos are of Bakers Beach. The top one is a short part of the beach and the bottom one is the long beach and just as long in the opposite direction.
Below the walkway out from the beach.