One of your first stops should be Onslow Visitor Centre. Here, you'll be able to find your bearings and get some great ideas before you set out exploring.
You'll soon discover why this Onslow tourist information center is popular with travelers. If you're looking for other things to keep you busy, Sunrise Beach, St Nicholas Anglican Church, and Good Shed Museum are in the area too. They won't take very long to get to from Onslow Visitor Centre.