Miami Swim Lounge, Doral

If you mail a letter to Miami Swim Lounge—a shop dedicated to designer beachwear—expect it to come back stamped "return to sender." Instead of having a permanent address, the shop pops up at hip Miami spots such as Chalk and the Savoy Hotel. The one constant is the selection of swimsuits, sandals, summer dresses, crab-sized bikinis, and bags that hail from an array of designers, which in the past have included Zella Machado and Aluna Swimwear.