I have fallen quite a few times on it, and even fell over the edge twice
now.

Limit your intake to two beers before going outside. G

Anyone got any suggestions?

If you have a decent marina or boat shop/supply place in your venue, go down
and talk to the folks about antiskid coatings. Another possibility is an
industrial supply firm. Some products might cover over the wood look that you
like, but consider the jury awards if you have a litigious guest take a tumble.
Good luck and be safe.

Joe