Other than flying it's the fastest way to get to Victoria from Seattle. My wife and I have done the trip. Going up in the daylight is great if it's a clear day. Bring a book to read or an ipod if you get bored with scenery, it's a long boat ride, especially going back in the dark. We've gone up in the morning and come back on the same evening so we can maximize our time in Victoria without having to stay overnight. Victoria is very walkable, you'll find lots to do. We loved the Royal BC Museum, check online to see what the traveling exhibit is when you plan your trip.