Yes, you can take your car on the ferry but the fare is considerbly more than walking on the ferry.
Washington State Ferry fares: Seattle to Bainbridge Island
If you are planning to extend your stay beyond our tour, a car may be appropriate although the "downtown" area of Bainbridge Island and some lodging is available within walking distance of the ferry terminal.
IF you bring your car there is parking close to the ferry terminal. As you drive off the ferry you'll see a paid parking lot on the right side before the first traffic light at Winslow Way. If you miss the lot, take a right on Winslow Way and you'll find another entrance to the ferry parking lots.
Park your car and walk to the ferry terminal - the Kitsap Tours' bus will be parked near the yellow Visitor Information booth.
It is helpful if you let us know you will be driving on the ferry so we won't be looking for you coming off the ferry and so we will wait while you find parking and walk back to the terminal.