Intramuros (literally, "within the walls") is the historic center of Manila. It is surrounded by thick stone walls and a vast golf course. Inside you can visit what is left of Manila after it was destroyed by the Japanese during World War 2. You can walk its cobble stoned streets and visit Fort Santiago, the Manila Cathedral, the San Agustin Church, etc. There are also lovely restaurants and souvenir shops. You may also want to try the "calesa" (horse-drawn carriage) that would take you around Intramuros up to nearby Rizal Park, but it's a bit pricey. 😉