From Siem Reap to Sihanouk, take the Hotle Bus of 168 local companies. It arrives in about 8 hours. The price needs bargaining. I remember it's 12 dollars. The place is relatively small. There are few Europeans and Americans in a very clean seaport. The hotel has a high cost performance ratio and basically has a swimming pool. We like to rent motorcycles ($4-5) and play around the harbour line. It's also interesting to rent a boat, or a speedboat to enjoy the sea, or to spend a day at the seaside and in the waves and enjoy a seaside spa quietly.