Wonboyn offers a 5km stretch of spectacular, unspoilt and generally empty beaches on Disaster Bay.
Greenglades, pictured right, is 4.5km from the park, via an all-weather National Parks track through the nature reserve.
Turn off this track 1km before Greenglades and drive a further 4.5km to Baycliff and the Estuary. Midway along the Baycliff road you can stop and take a 700m walking track through natural banksia forest to get to Middle (Wonboyn) Beach.
Many surfers rate Greenglades well when the surf's up, and it can be afe for swimming, subject to all the usual cautions about swimming off unpatrolled beaches and prevailing conditions.