Koh Phangan island is located around 7 miles from Koh Samui and the only way to get there is by ferry. It took us 45 minutes to transfer from the Nathon Pier on Koh Samui to Thong Sala Pier. A one-way ticket cost us $5.96 each, which we bought via Ferry Samui site. Ticket or confirmation must be printed, so maybe ask to have it printed at your hotel, like we did. With a printed copy, you need to go to the company office, located across the road from the pier and exchange it for actual tickets. Tickets cannot be redeemed on the Pier, it has to be done at the office. We saw many tourists get turned away to get tickets at their main office.