Hong Kong has about forty public (公共的) beaches. Some of the beaches are among the best in the world. P eople can go there for a swim. Y ou can go to most of them by bus. T o go some of the beaches, you must take a boat. T here are toilets , changing rooms and places to buy food and drink on most of the beaches. Y ou can swim there without danger if you remember these instructions (须知) : (1) Never swim alone. (2) Never swim after a meal or when you feel hungry or tired. (3) Don ’ t stay in water too long. Remember: A red flag means that it is dangerous for anyone to swim there. A blue flag means that it is dangerous for children.