And as often as your wallet can afford the trip --- travel by boat isn't cheap. I noticed that they didn't mention the cost of the boat taxi; either it is a free shuttle, partially subsidized, or in worst case you'll cover the actual cost of the boat trip (a ferry in Seattle cost me $20 one way when I was there years ago; gas prices have gone up since, boats get horrible mileage, and they depreciate quickly and need lots of upkeep in salt water).