Lake or beachside camping for kids and SUP

Yuraygir National Park; if there is enough of you book out Illaroo Campground, if not just 400m south of there in the general campground, just north of Wooli.
Inland camping spots aren't likely to have too much flowing water with the drought, otherwise there are numerous Farm stays on the Clarence River and Macleay River
Sanden River just north of there is magnificent but gets overcrowded. You could also look at Pebbly Beach at the southern end of Yuraygir (half way between Coffs and Grafton), but you need a 4WD.


https://www.nationalparks.nsw.gov.au/camping-and-accommodation/campgrounds/illaroo-group-camping-area

You could take a look at some of the National Parks in that region, including Bundjalung NP (Black Rocks Camp Area) which is north of Yamba, or Yuraygir NP which has a number of campgrounds.

Noting, I'm not sure how secluded these will be during school holidays or during the warmer months. Hard to find anything secluded on a lake or beachside on Australia's east coast these days, especially given many (read most) people have "WikiCamps" on their smart phones...

Enjoy your holiday,

Cheers, Baz - The Landy