Cape to Cape trail from Cape Naturaliste Lighthouse to Yallingup
Found out about this run from that red bull guy who did the 'best' trail run in each state in 7 days. Some of his choices were a little questionable but I'm not going to argue with him on this one because it was incredible. The first 8k were just stunning- beautiful water and beaches, awesome rock formations, really enjoyable and varied trail- had a massive grin on my face the whole way. The last third was a bit less enjoyable (a bit tougher going in the sand and views weren't quite as spectacular) but even with that I still rate it as one of the best runs I've done.
https://www.youtube.com/watch?v=YOUadIs04DQ