Extensively refitted in 2015, National Geographic Sea Bird is a small, no-frills charmer of a ship that carries 62 guests in low-key comfort to off-the-beaten-track ports in Alaska, the Sea of Cortez, and along the Columbia and Snake rivers. The Lindblad Expeditions ship is for true explorers looking to delve deeply into ports, with a top-notch expedition team and trekking and kayaking galore.