Cattai National Park
Time Out says
Get close to nature at Cattai National Park, which sits pretty beside the Hawkesbury River just over an hour's drive northwest from Sydney. If you're keen on camping, there are hot showers and flushing toilets at Cattai campground where you'll be surrounded by gloriously vibrant greenery. Bring your bike for a ride around the park and your binoculars if you like spotting rare native birds.