Changi Point is at the eastern tip of Singapore. It is a favourite place for camping and swimming by the sea. Changi boardwalk is a few kilometres long all the way from where the Changi Swimming Club is to the Changi Jetty where bumboats ply to Pulau Ubin (one of Singapore's island for S$2) and Pengarang, the eastern southern tip of Malaysia with a quaint village known as Sungei Ringit
(you can take a bumboat there for S$7, must have a valid passport as you're crossing to Malaysia)
At pengarang, you can eat butter lobster (delicious!) for only US25 a kilo.