Since you’re wading, and presumably your hands will be wet with saltwater, I’d carry along a couple of ziplocs with dry (or maybe slightly moist) towels (paper or cloth) to wipe your hands off before you shoot.
If it’s windy, be particularly careful of salt spray. Amazing how tiny droplets can be deposited on all surfaces . . . and sneak inside . . .
When you’re all done and back home, after the final wipe, leave the camera out where it can air dry completely, and where you can watch for any developing corrosion.
And insurance is a really good investment . . .
Buzz