Costambar doesn't have many tourists, but all of them should stay at L'Oase. Tastefully adorned in Dominican art, the charming villas contain 12 bedrooms surrounding a relaxing pool and restaurant, and the whole thing is tucked away in a lush and private, well, oasis. Owners Joe and Vasthi are welcoming and knowledgeable, and regularly host missionary groups.
Fun surprise: there's a fully functional indoor racquetball court on the premises (and Joe is quite good). Be sure to call ahead.