You don't book a room in Condado, an isthmus lined with beachfront condos, hotels, fabulous restaurants and bars, clubs, and casinos near downtown San Juan, because you love stand-up paddleboarding. (Stand-up bar-hopping, that's another thing.) But every day more and more locals are shelling out $1,000 and up for paddleboards so they can slice through Condado Lagoon, which separates Condado from the mainland. And now a start-up company named Velauno, which I discovered with a little help from Google, is offering lessons and rentals to all comers. And I found that what makes SUP fun is... keep reading