I live in the desert, as such have a good amount of experience in takeoffs and landings on sand.
I carry a fold open beach mat with with, and put rocks on the corners, this gives a relatively sand free touch pad for landing on and taking off.
point your camera slightly down on takeoff, this seems counter intuitive, but it helps avoid sand sticking to the lens.
Also, take a small paintbrush with you, and you can brush the sand out of hard to reach places.
The last, and possibly most important tip of all....... watch out for the wind direction, any sand you kick up will blo into your eyes and blind you if you are downwind from the craft...... this has caught me out more than once, and it isnt fun to have something in the air that you cant see because you have sand in your eyes.
That being said, avoid low flying near people or things that dont like sand for the same reason. I find that below 5m will kick up the sand on the floor.