When landing on a beach always do a zero speed as TC says. You will get very little blown sand that way. Be aware that any slight padding may liquefy the sand to such an extent that a skid or wheel will start to sink in.
In my previous life I used beach landings as a method of finding lost children. I would get HMCG to stand the parents on the bonnet of their landrover then land the mighty Wessex next to the 'rover. 9 times out of 10 the missing child would join the rush to see the helicopter and its dashing crew
and therefore be spotted by worried Mum and Dad
HF