This is undeveloped non-tourist Thailand. We took the 3rd class train from HUA HIN which was very, very cheap (something like 35 baht) and a great experience passing through scenic countryside. On arrival at Bang Saphan Noi train station we were surprised - there were no taxis or tourists at all. We called the owner of Sananwan Beach B&B who contacted one of his friends (a semi-resident at the B&B) to come and pick us up. It took a while, as we had not booked in advance, and the friend was busy elsewhere, but we eventually got there.
The Beach B&B is a large house about 100m from the beach, and there is very little else around. The area is almost completely undeveloped, which means no restaurants, no bars, no supermarkets. For some people it will be heaven. The beach is about 5km long, and is completely undeveloped. Most days I would be the only person there; it really is amazing to have your own beach to yourself. On the downside, because there is nobody going there, nobody ever cleans the beach, so there is quite a bit of litter and debris washed ashore. But the raw isolation made up for this, and I really enjoyed it.