For cool granite and easy bouldering that I can guarantee a decent day out considering the trip, Toodyay boulders are great (it’s not in Toodyay, don’t worry).
If you’ve got gear, go to the main area in the guidebook, if not (it’s worth a look anyway), check out roadside, mad max and secret garden. If you can get into midland and go up Toodyay Road, it’ll be a few minutes up the hill, up RedHill way. The road flattens out for a bit and there’s main area on your right and other stuff on your left.
A mate and I went on a mini-expedition in search of a patch of massive bare granite we spied from the road once, but turned up nothing, ah well…..