Arrrrrgghh. That first day on the sand. That was hard work. Must have had the GSA chuck me off at least 6 times. Did I mention I hate sand. I was somewhat bruised and battered after that trail. At least I didn't break anything and managed to carry on.
I don't mind falling off, it's picking the thing I find the hard bit and that's on a light dirt bike. And then it can get into a downward spiral... exhausted from picking it up, concentration not as good, fall off again, more exhausted and so on. Not telling anyone how to suck eggs but my top tip is give yourself a couple minutes recovery between picking it up and going again.
No doubt sand technique has been discussed, I think body weight to the rear, get the front light and plenty of gas it's quite easy from this sofa
Have a great trip.