Since the Philippines is an archipelago, it depends on where you are going. If you are looking for beautiful beaches, Boracay and El Nido is the hottest spot. If you are a nature lover try to check out Sagada, Mt Province and Bohol. And if you want to go diving or do surfing go to Siargao or visit Tubbataha. To be honest, a 5 or even 10 day tour is not enough to visit the Philippines so you better prioritize.