Did alot of research on perth.
For south perth Self drive.
Stop at Bunbury for lunch, then go down further to Busselton, to see the beautiful longest jetty with their fantastic aquarium and pristine beach.
Then down geographe bay to Lighthouse near Dunsborough, and pass gracetown area, to margaret river, which is full of wineries and choc factories,etc. if Albany is too far, turn back up to perth through another route.
You will pass nargorin area and nannup, lovely towns with beautiful gardens and old post office. These small populated towns makes you feel like you're in a old movie. then move up, you will see farms, wildflower patches along the way, feel free to stop by any towns for toilet breaks and walk around.
If nature is your thing, along this route , you will have tons of national reserves and hiking to do. Just have to google Self drive south perth!
YOu can finish these trip in 2 days, leisurely. stop over at margaret river area for a night's stay or busselton. then if you are recharged, head up to Albany. Along the coastal line, will have lots to see. Albany's beautiful wind farm. Treetop walks, natural's bridge, caves,etc.