WRITTEN BY KATIE SMITH Nestled along the shores of Penobscot Bay, the historic and charming town of Belfast offers small-town charm and coastal beauty. Its lively, artsy downtown and working waterfront make it the perfect spot to spend a day — or an entire vacation — browsing unique shops and galleries, hopping on a boat tour, or exploring Fort Knox. With so much to do and see, one thing is certain: you’re going to work up an appetite. Whether y…