Just a warning Alfie, there will be "young" men with avatars that look like Brad Pitt who offer to act as tour guide for you. They are actually grey haired, married, 60 year old men with prostate problems. Take their advice but don't accept a lift!
I would head North this time of year for warmth. Will be a bit early for sea breezes but you might get lucky with frontal wind or an early seabreeze. Most stops have an area where you can do some flat water sailing. Lancelin, Cervantes, Geraldton and Kalbarri.
have fun and remember I have warned you