Landing at Koh Samui airport is by far the quickest way to reach the island and the more expensive too, anyway if you have your days numbered maybe this is the best way! If you have more time you can land at Surat Thani airport and from there take a bus until Donsak Pier (1h40') or to Tepee Pier (30'). The ferries to Koh Samui will last about 1h30' and you can arrive at Bangrak Pier, that is the closest to Timeless (20' by car) or Nathon Pier is on the opposite side of the island (40' by car). We can help you buying the package bus-ferry-transfer to the hotel! If you are backpacking around Thailand you can even go to Surat Thani by train or by bus and from there reach Koh Samui by ferry.