Kurà Design Villas, the love child of an architect and a biologist, marries modern luxury design with ecoconscious sustainability at this adults-only resort high above one of Costa Rica’s most iconic coastlines. From the saltwater infinity pool, guests can gaze down at the Whale’s Tail, a natural rock-and-sand formation at Marino Ballena National Park, one of a half-dozen national parks in the area—or, with luck, catch a glimpse of migrating humpback whales. Every suite has a generous terrace with views over the rain forest to the Pacific and, in the evening, stunning sunsets; binoculars are included in every room for bird- and wildlife watching. It’s a resort definitely designed with romance and couples in mind, from the all-glass shower with two rainshower heads to the hammocks built for two. And if you ever do decide to emerge from your gleaming glass-and-teak room, there’s a restaurant that serves sustainably caught seafood and dishes made from the greens and herbs grown in the on-site garden.