I frequent the Murray in SA and always love a glassy paddle.
Every time the Murray Princess paddle steamer goes past, I think about surfing the wake. Generally theres too many jet ski's, but if the chance presents, anyone think this is possible? The link below suggests not, but i reckon the waves are easily powerful and fast enough:
www.seabreeze.com.au/Articles/Stand+Up+Paddle/The-never-ending-SUP-wave-with-an-old-school-twist_5459892.aspx