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A small beach and swimming area enclosed by sharks nets that is shallow enough for young children. There are bathrooms and a large playground next to it.
© OpenStreetMap contributors
The ferry to Dangar Island leaves hourly. You can take a ferry across and just sit at the wharf coffee shop on the other side and wait for a return. There is also a bowling club here with limited hours, for lunch, dinner and a beer. For a little more activity, you can walk around the island in a couple of hours. It's part bushwalk, part river views, and part observation of the island habitations, which are half hippy style with vege patches and half mansion style with sweeping vistas. Locals are friendly, and you don't half to walk far from the wharf to feel a million kilometres away from everything.
There is a good trek between Brooklyn and Cowan Train Station via Jerusalem Bay. It takes 3-4 hours, and with no facilities or roads on the way you should ensure that you have packed enough water and food. The section heading out of Brooklyn is steep up hill, and requires moderate fitness.