Tempting sign, at least for my son it is! Lol!
I see the sign above not as a kill joy, a sign to keep me from having so much fun on the dunes, but a rule or guideline to protect the beach. It's the same way we should view God's "rules" or "guidelines". God is not trying to keep us from fun, but from pain. He is trying to protect us!
John 10:10b "...I have come that they may have life, and have it to the full."