idk about mild maple flavor raw, but it is like sweet water right out of the tree. I have never purified it or microwaved it. we just boil it down to syrup. idk where maples grow elsewhere in the continent, but you can get maple syrup from all types of maple trees, not just sugar maples. also you can get syrup from some pines and other trees, it just tastes different. like hickory tree sap I hear has a smokey, slightly bitter taste.
you do need cold weather for the sap though. we tap the trees when temperatures start to get above freezing. but freezing at night helps create this pressure in the tree that pushes out the sap. so freezing at night, above freezing in the day.