The shuttle boat at the hotel goes back and forth from Sathorn Pier every day. There's a schedule that shows what times the boat will be at the pier. You can get on or off the boat at different stops along the river, not just at Sathorn Pier. If you want, you can also stay on the boat for a full round trip. If you're staying at the hotel, you don't have to pay anything to use the shuttle boat. It's free for all hotel guests.