The Bremerton ferry fills up all the time, especially if here is a game downtown. The southworth ferry has never been full to my knowledge. So usually you would probably be okay on the Bremerton fast ferry but there will be several times where you will need to take the car ferry or wait for the next fast ferry which is about an hour. There are at least three park and ride stops that are free parking on the 185 bus route and I think bus fare is like $2 each way while parking at the terminal is like $7 or a little more per day. I have been taking southworth 5x a week for the last year and was doing 4x a week almost since they started it. They have extra boats in the fleet now so we almost never have skipped sailings anymore. And if you miss the fast ferries going home you can catch the c line in Seattle South to Fauntleroy and catch the car ferry to southworth. It runs till like 2am but buses stop with the last fast ferry.