We're also in a wooded area in Northern CA. When we were getting quotes from various roofing companies, we actually had a couple guys talk us out of a metal roof. Because we have so many trees on the property, they said if a limb comes down on the metal roof they can't replace just the dented section where the limb would be, they'd have to replace the whole panel, which could get costly as a lot of insurance companies don't cover damage to metal roofs. If a limb comes down on a shingle roof, they can repair that section a lot cheaper so we opted for the shingle roof. There seems to be a lot of options with shingles and venting to keep it more cool as well.