We used the Expeditions Ferry to go to Lanai for the day. The ride there was fairly smooth, about 45 minutes. The ride back was atrocious, but that's because of the waves and winds so not the ferry's fault. Every ferry I have ever been on has been the same in that regard. The kiosk to purchase tickets/redeem vouchers is hard to find. There are "slips" on the pier and Expeditions is to the right of slip 1 off to the side. $30 per person, per way which isn't too bad.