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From everything I just looked up, it's native to the Philippines. It wasn't native all the way up to Luzon from what I picked up, a long with a few islands. They have been in the Philippines since the 1800's from what I have read.
Next time pull that beautiful snake out and get photos. The Costa Rican Boa, is very beautiful in my opinion of you found a good one. I use to have one as a pet in the USA, and he was outstanding in color with a nice blue gray color to him.
It's a Luzon Banded Coral snake, very venomous. I'm Jealous because I want to take my own pictures of that snake. If you have Facebook look up Philippine Herpetology. I'm putting together a FB Database of endemic herps of the Philippines since it's hard to research it. Also I started a Philippine Snakes Mission you can use to put reptiles in. Nice shot by the way.