First of all, don't worry so much! Simple precautions will do nicely. Yes, do enjoy the beach!
UV filter on the front, sunshade. I use a bit of Palm Pilot screen protector film over my LCD screen,and it has worked fine for the last 3 years. Change it when it gets a bit tatty. Keep the camera in some sort of plastic bag, when not shooting in grim situations. A gallon Zip-Lock comes to mind.
When I was a reporter for a western daily, I carried my camera and lenses in a yellow Forest Service 33 gallon garbage bag. It was a bit large, but kept everything free of the ever-present dust. I got more on the camera covering rodeos than I did otherwise. I did clean/dust the equipment with a camel hair brush and blower on a regular basis.
I could leave that bag, and camera equipment in the unlocked car, and never worry about somebody stealing it! Disinformation!
But: don't tempt fate. Normal security precautions, always.
I use a motel shower cap to cover camera and lens when it is raining. I hook it around the body, then use my left (zooming) hand to hold it securely around the lens. I get wet, but the camera doesn't!
If it gets a bit damp, let is sit inside for a while to dry out. Water never did much good for electronics. Last extreme: lens on, use a hair dryer on LOW! to dry it. LOW, and from a distance! Plastic will melt!
If it is really windy/blowing with flying spray and sand, etc., don't shoot! Unless your editor is not the understanding type. Then quickly!
For cleaning, a microfiber towel, slightly damp to wipe the salt, etc. from the exterior, then lens cleaning fluid, and another microfiber cloth for your exposed glass, including viewfinder and LCD screen. GENTLY!
It's all good!
