When the flagship Thompson hotel opened in the heart of South Beach last November, it became the address for Miami’s cool crowd. During the day, guests bask poolside on bright yellow loungers under blue-and-white striped umbrellas. At night, the scene moves into a historic bungalow turned speakeasy. Decor in the 380 rooms is Mad Men meets SoBe, with stocked art deco bar carts. From $399.