The Tia Falls Camping Area is a good camping spot with free firewood, public toilets, with large level caravan sites. You will encounter Kangaroos and Wallabies and nice easy walking track to the falls 750 metre one-way, (then 750 metres back haha) take your camera as I'm sure you will need it.
You'll need to make an online booking before you stay at any campground or campsite in a NSW national park. This includes locations that were previously available for use without a booking.