I've been out at Dunes and no probs, seemed the same as any other break where reasonably sane people enjoy themselves surfing. Of course there will always be exceptions no matter how hard you try, especially with a mix of annoyed locals and greedy travellers. As pickers said - respect.
There is another break at Hunters Beach which is pretty good for SUP as well.
Both breaks are well known so expect that if a wave is running then there will be people out.
Lucky you and Good Luck!