Surf photography by sUAS has a unique set of challenges. Equipment is the first. To avoid glare, you'll need a circular polarizer and to cover anything reflective on the lens front. You also might want a GetterBack, incase you lose your sUAS in the water.
You'll be waiting for the surfer to catch the right wave, which could mean you burn through an entire battery and only get one chance. Shooting in RAW can take so long, that you also only get one shot, but it also brings much higher quality in post processing.
If you aren't a surfer or familiar with the spot, try to ask someone who is the best surfer out that day, or at a minimum, watch to see how the surfers are positioning themselves. At this spot, the best surfers were several hundred feet from the rest, catching the bigger waves, but you couldn't see that pattern from the ground.
You'll need to be relatively low, about 20 feet. At that altitude, you need to be wary of any altitude drop as you move around, or particularly large waves. Watch the direction of the current, and position yourself a little "downstream" of the surfer you chose to follow.
Even if you don't get a good shot, it's hard to beat a day on the beach while the rest of the country is stuck in snow!