Wilyabrup is very nice. Especially combined with the other distractions of the Margaret River region.
You will find Bob's Hollow limestone incredibly disappointing if you have climbed overseas. But it is a nice walk and if you try hard you will be pumped out by lunch time.
WCH is excellent. But problematic without a 4wd and you probably don't want to take a rental in there as it is proper 4wd-ing. You will need 1.5 racks worth of gear. Up to #3 camlot will be ok. If you can only fit 1 rack in your bag and 1 rope, there are still some good things to do that you can walk to the bottom of. e.g Vulture Street.
Driving to WCH from Margaret River, Mt Frankland is worth a 1day or 1/2 stop at.
Spend 1 day at Peak Head, near Albany and near WCH, and that will be your week and time to head home....