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How far is Mt. Pinatubo from Olongapo? Also, are there any WWII POW sites in the Olongapo area? - how mt.pinatubo got its name

I'm in the Philippines for the first time, 26 January to 3 weeks vacation. I do not want to rent a car when it's pretty easy to move around and not too expensive, but if necessary to see the places of great interest to me. I am a man, mid 50s, good health and fitness, the United States and speaks only English.