Purchase a ticket to see a game at An Giang Stadium. If there's nothing scheduled while you're in the area, you might like to check if they offer a tour of the facilities.
You'll soon see why this Long Xuyen sporting facility is popular with travelers. If you're looking for other things to see here, An Giang University, Long Xuyen Catholic Church, and Guan Yin Temple are in this area as well. They won't take you long to reach from An Giang Stadium.
