Thanks to all for the great information about Washington and Oregon. We feel much better about our trip.
The location of the campground on the inner harbour in Victoria is great. Not sure about amenities and the layout. You can walk to downtown from there along the water, whale watching, float planes, buskers in front of the Empress Hotel, restaurants, night clubs, shopping, etc. Depending on your time line, the first weekend in August is a long weekend here, and the local symphony puts on a concert from a barge right in front of the Provincial Parliament buildings. It is a favorite event drawing upwards of 40 000 to 50 000 people to watch from their kayaks, sailboats or lawn chairs on the lawns of the parliament buildings. It's called Symphony Splash.
There are great campsites all over the island. Seeing the entire island would take a couple of weeks. It is at least 600 miles tip to tip and about 100 miles wide. Tofino on the west coast of the island is a favorite destination and I don't think you will be disappointed. Going north, lots of great scenery and campgrounds. Just be aware that it is expensive to get here on the ferry. The cost with me and the wife with trailer in tow has been $240 Canadian, one way. That is a rig, truck and trailer, 48' long. The first 20' is included as the cost of the passenger vehicle, then it's around $5.50-$6.00 a foot after that.
Weather on the island is varied. It can be beautiful and sunny at the southern tip and there is rain in the north. If you come late spring, you could be kayaking the inner harbour one morning, and snowboarding on Mt. Washington that afternoon. I think this year will see a long ski season. Mt. Washington currently has over a 5 meter or 6 yard base. Crazy amount of snow.