bring cash... at least 800 pounds and try to work around that budget... if you feel there is a need to spend more, then you can withdraw from your ATM, but call your bank when you do... there are loads of decent money changers in Cebu... if you feel it isn't safe, go to SM Cebu's customer service.. they have money changing there.. or to a money changer in malls...
whenever my bf visits, i prepare and excel sheet of estimated cost on a per day basis.. with the activities/itinerary... with that, bf has a ballpark figure of how much cash he brings...