Follow the main highway south out of Perth, toward Bunburry, Denmark, etc. and look for billboards for the Tree Top Walk...that's how we found it! And it takes maybe only 30-45 mins to cover the whole walk. Insiders tip: make sure you take the non-treetop path that juts outside the other side of the gift shop for an opportunity to stand in the middle of an opening in one of the tall trees!