There is another route down to Albany from Perth - an inland highway, that passes by a park known as Stirling Range National Park. The best time to visit is spring, where flowers of all kind bloom. There are, of course, hiking opportunities in the park, and thus, with the abundance of flowers along the hiking trail, makes for a really enjoyable "walk in the park"! :)
There are accommodations in the Park itself, which is recommended if you want to enjoy the full day in the park instead of commuting to nearby towns. An example is here. If you are planning a driving circuit down southern WA, esp in spring, then this is definitely a good stopover. You start from Perth and come down via the inland road to Stirling Range, enjoy a couple of days here, and continue down to Albany and from there, do your usual route back upwards via the coastal Margaret River region. If you are a wine and flower person, you have the best of both worlds! :)