It's a known secret that Jamaica Plain -- or "JP" to the locals -- has some of the tastiest and freshest food in Boston, but it's a bit hidden from the "beaten path" destinations such as nearby Fenway Park. In fact, some JP residents want to keep it that way, and this tight-knit community is definitely keen on preserving the neighborly feel. Originally part of Roxbury, Jamaica Plain was first home to wealthy and middle…