What should we do in BC / Pacific Northwest USA?

4-5 days is not long enough to warrant the drive to the rockies. From Victoria, I would suggest catching a ferry to the olympic peninsula of washington. Catch the Victoria's angeles ferry and drive around the coast, it's breathtaking and has really nice camping sites and picnic areas. I would also suggest a day drip to Seattle, pike place market, the underground city tour and the space needle.