Getting an extention visa is so easy. You do it on arrival in manila. Line up in the immigration queue as normal, when you get to the officer, tell him you need a longer visa, he directs you to the door on the left. You go in, tell them you want to extend, they get the ok, you pay, then go back to the immigration line and wallop!! you get your stamp. I have done it a couple of times already. No hassle.