Serve people at the beach and let them leave happy. Don't make them wait for too long and deliver what they have ordered. Clean the tables after it and see how much you have scored.
A beach bar is a perfect place to chill during the summer time. However, the amount of visitors is so high, that the waiters are barely handle with the pressure. Prove that you are a real professional and serve them without delaying the orders. Get cash and clean the table after they leave, so other customers could take the place.