a good spare tire.
a good jack and a sturdy board you can use as a jack board.
a set of spare tire valve stems, stick them in a ziplock and put them in your glove box. If you ever damage one you'll have one on hand.
A shovel, hit an army navy store and see if you can find a low priced entrenching tool (stow the etool as a backup shovel)
A good tow strap
first aid kit
If you do your own brakes, grease the brake shoe retaining pins REALLY WELL! I ran the beaches tons in my old truck and I went to do my brakes one year and the brake pad retaining pins were bonded to the calipers. I greased them real well after that and have never had that same problem.
when parking on super soft sand. drive a bit past where you want to park. and back up, so you pack the sand a bit, makes taking off much easier
grab a few tire gauges
If you cant hit a car wash on the way home, just throw a lawn sprinkler under the truck while you unpack and stow your gear, its not a car wash but its better than nothing.
Its neutral, then four low
crawl underneath it and find your grease fittings (nipples,zerks) I've gone as far as marking them at times with day glo road sign paint (flo orange) when you go in for an oil change ask the kid who did your oil and lube to get the x amount of grease fittings, they're marked flo orange. that ensures you get them all, every time.
have fun be safe, and dont panic if you hit super soft sand.