If you are planning to go to El Nido and have some island hopping tours and beach bumming, Php8500 is already okay for 2 persons for 4 days and 3 nights inclusive of transfers.If you are planning to go to Puerto Princesa to see the famous Underground River and hop on for Honda Bay Tour, Php9000 for 2 persons for 4 days and 3 nights will make you survive.
I'm taking a personal challenge with this trip and even trying to prove to my friends that P10,000 is too much for a 4 days and 3 nights all-in vacation in Boracay. A lot of people I knew told me that P20,000 is not enough to suffice your stay in Boracay. They even added that food and water activities and even accommodation were lavishly priced and not reasonable. Hmmmmmm.