Yalgorup National Park and the Martin Tank Lake Campground has is a trail walk from the campsite called the Lake Pollard Trail nominated as a grade 2 walk of 6 kms, there is an alternate return route for the adventurous. I just met a couple of German travelers who had been told that the best time for the walk was in the late afternoon so I went on the trail with one of them and am back after taking the adventurous route, hot and sticky but in one piece.  John

Edited to add the Camps6 reference number #139