Another bit of advice, when you arrive at Manila airport and get your bags ready to leave the building, you will be bombarded with lots of willing people who will try to take your case. DO NOT LET THEM..!!! just be polite and firm if they start to reach for them. If you are staying in the hotel next to the airport, it is only a short walk. If you really need a guide for that, then you can, but only give 50 peso max for that.
LOL your in for a fun as soon as you leave the airport its semi organised chaos outside (im not trying to scare you, just preparing you!) as Steve.r says be firm but polite with the porters who try and get your baggage and as you walk down the long ramp on the left hand side of the pick up area there should be the aiport taxi, use them as they are metered and fair but make sure the meter is running!
but just relax and take it easy... an you will be fine
