I'd go too this w/end but i goto go to a wedding interstate

. I went to Canton Swamp last w/end and it took almost 2hrs. I hope Umina is at least half an hour closer to Syd.
For me Narra and longy is about 45 mins. But being a noob the waves bash me so i prefer flat too. Canton swamp is good for westerly's. Wear booties tho heaps of weird stuff on the bottom and heaps of weeds.
Let me know how it takes you to get there from Sydney. Enjoy!!!