Vancouver Island Roadtrip advice

The family and I are heading north from Seattle to explore the island this summer (July/August). We are planning on taking a long week with the kiddo (18 months). We've never been past Victoria so we are taking the ferry to Nanaimo and going from there.
Are there any <i>must do</i> stops on the way to Tofino and Long Beach?
Any campground recommendations?
Any advice on roads, weather, other travel issues?
Any advice is appriciated!
Thanks
Are there any <i>must do</i> stops on the way to Tofino and Long Beach?
Any campground recommendations?
Any advice on roads, weather, other travel issues?
Any advice is appriciated!
Thanks