For sunny days, men and women will want to bring hats and sunglasses. On cold-weather cruises, you'll need a warm beanie, scarf, gloves and waterproof gear. (Antarctica and Arctic cruises have unique ...

At first glance, North America’s two main deer species—the whitetail and the mule deer—can look very much the same. But there are important differences, and being able to spot them will not only help ...