Bob's Hollow and Wilyabrup are definitely the crags to visit if you're going to Margaret River. Funky limestone sports climbing next to the ocean at Bob's and adventurous mixed/trad on granite also next to the ocean at Wilyabrup. Unless you climb high 20's or it's raining I wouldn't bother with Wallcliffe, especially if you're allergic to bees. It's in a nice location next to the river, but it's not a very inspiring crag. The routes there are short and often in close proximity to large bee's nests. You can boulder/climb there in the rain apparently. There's a fair bit of bouldering around Perth but not a lot near Margaret River as far as I'm aware.