I am used to driving in the snow, where I put my truck in 4H and usually don't lock my hubs unless the streets are real bad. On the beach should I keep my hubs unlocked?
It is a bit different than snow. My suggestion is that if you feel your front or back "drop" - don't try to rock it, or power out. It won't work, you'll just dig in deeper. Grab your folding camp shovel you picked up at Wally-world, remove the couple of inches of sand from in front of your tires and drive out.
I don't think you're being overly concerned. It's different. I'm a well seasoned snow driver also, and just had my 1st beach driving experience. It's not the same. But it sounds like you've got your wits about you. Know your truck. Don't be stupid. Be prepared. Air down. Don't be hard on the gas peddle, but don't be afraid to use it. I also found it helpful to stay geared down to keep my engine RPM up. Never went higher than 2nd gear. Know your ramps, and which ones are priority. When they say "May be impassable at high tide" - they mean it. Download a tide app and have a general idea where it's at while you're on the beach. Most of all - have a blast!