One of our favorite activities here in Sunny South Florida is boating. I don't think I could ever be far from the water, even if it's a lake or a river.
This is one of my own photos... It's purely gratuitous... No hats, but I love the shot.
One of the best things about boating is the sun. One of the worst things about boating is the sun. A good hat will help you stay comfortable and protected.
What makes a good boating hat? The best thing is a snug fit. Many Caps work well and of course many people like to reverse the cap so it doesn't fly away so easily. Otherwise look for a chin strap to help keep it on in the wind.
Your hat should be water resistant and easy to dry. Even better if it floats!