Not sure this is Rving or just touristing. There is lots to do on the Island or Mainland--you can't do it all in that short a time.
It is warm on the East side of the Island like at Parksville, but you will need a jacket on the West side like at Tofino . Good scenery though like at Long Beach. (except in fog late August)
You are going to miss the early Aug long weekend here by being still in WA. Beware of the Labour Day weekend here for being busy if still here.
Look at going up from Victoria to Comox (side trip to Long Beach), cross on the ferry to Powell River, go south from there to Vancouver (more ferries) then down to Seattle. Lots of scenery, etc.