Away from the road and on a great piece of beach, this is the place to stay at Hat Thung Wua Laen as long as you don't need full-on luxury. The rooms have verandas for lounging and, while an upgrade is in order, they're still plenty comfortable. They can arrange a private transfer from Chumphon for 350B.
They follow a few green practices including growing some of their own food for the Banana Cabana restaurant, which is worth a meal even if you aren't staying here.