This laid-back, 62-guest ship from UnCruise Adventures focuses more on nature than almost anyone else at sea. A typical day during a Northern Gulf of California Adventure in Baja, Mexico consists of kayaking or paddle boarding off the back of the ship, or taking an inflatable skiff out to watch for wildlife while onboard experts weigh in. And even though the emphasis here is on the nature and not onboard entertainment, you might find yourself lounging on the sun deck, cozying up in the library, or grabbing a drink at the bar. Best of all, these spaces look newly refreshed as the ship was almost entirely rebuilt in 2016.