Intramuros Tour (map)
Intramuros is the older historic part of Manila. A lot of the Spanish history with the Philippines can be found here. You can take a carriage tour of the area, which is available to rent along the sides of the street inside Intramuros, or find a walking tour. The Bayleaf hotel has good food for lunch or dinner.
Rizal Monument at Rizal Park (map)
Corregidor Island (map)
“Historic fortified island where visitors can explore the remains of WWII tunnels & batteries.” Book through this website. The boat leaves Manila bay at 7:00am. The tram tours are good with lunch provided. Return to Manila bay is about 3pm.
WWII American Cemetery and Memorial (map)
“With a total of 17,206 graves, it has the largest number of graves of any cemetery for U.S. personnel killed during World War II and holds war dead from the Philippines and other allied nations.” - Wikipedia