Anse Union is the waterfront of L´Union Estate, a wonderful parklike property that is some sort of open-air-museum, showing visitors how life was like when people earned their money with Copra and Vanilla. You can read more about L´Union Estate in our dedicated article. The beach is nice, but nothing spectacular. If you wonder what the rails are that cross the beach: they were used back in 1986 for the film Pirates with Walter Matthau.