Philippines is a great destination for a holiday. Seven days will give you enough time to explore the country which is made up of over 7,000 islands.
As you'll have decided on spending two days in Manila, I would instead suggest three nights there because there is much to see, do and eat. Boracay is a great option for the remaining days. It is extremely popular among tourists and the white beaches make for a fantastic, restful vacation.
Or, head to Palawan after Manila. White beaches, an underground river, beautiful birds, wreck diving, eating and drinking--Palawan has something for every kind of traveller.