This is about the national park and also the surrounds.
The local community have fought for a long time to avoid heavy commercialisation of the bay and as a result it retains pristine waters with dolphins, and occasionally whales in the migration season. You can go to the headlands to see whales when they go north May-June and come back south October-November.
Various camping options in the park, plus limited higher grade accommodation. Much more in Huskisson and Vincentia. Interestingly Hyam's Beach, closest to the Booderee Park, gets very high rating here at TripAdvisor. It's a trendoid thing, I think, no doubt heaps more iPads in Hyams than elsewhere!
There is a succession of beaches, inside and outside the park, this means that you if there is an unpleasant wind from one direction, there is a sheltered beach not far around the corner. You can go to ocean beaches. You can go round to the edge of St Georges Basin, through a magnificent banksia forest. Stop at the park entrance and see exhibits and get info. The park area is Aboriginal land, respect it in many dimensions please.
Entry tickets to the Booderee Park for a day; a two year pass also, for designated vehicle. Concession rates. Note that there are NSW state National Parks too, notably at Greenfields Beach. Families may find the shallow estuary excellent for children at the mouth of Moona Moona Creek, between Huskisson and Vincentia.
The cinema in Huskisson tries to have a serious film program and in August is host to the Travelling Sydney Film Festival.