If you fish, unless you're completely nocturnal, you're going to be spending time out in the sun. When on the water you're not only catching rays directly from the sun but also what reflects off the water. Prowling the flats for bonefish or stripers or fishing offshore are all tough (and dangerous) pursuits as it relates to your skin.
We've seen too many friends having laser surgery or worse at too young an age these days. Consider covering up with clothes designed to protect, use sunblock on any remaining exposed skin, and don't forget your sunglasses.
All the items here have at least some level of sun protection designed into them to help protect you from the sun. Stay safe out there!