Dont ask how I know - but take it from me:
1) Always "drag" the beach first at 30-40kts and go around to assess the depth of your tire tracks- then land.
2) Never land a beach forming part of an estuary
3) Beaches facing the ocean/sea are best
4) Beware of strong Xwinds and steep sidesloping beaches in taildraggers
All good fun, but very easy to make an expensive embarrassing mistake!
