If you think museums are staid and boring, then you haven’t been to Old Orchard Beach’s Harmon Museum recently. As you enter the foyer of Harmon Museum, you will be mesmerized by a series of prints by Portland artist R. N. Cohen which capture the flavor of lower Old Orchard Street in its heyday, when the world-class Carousel built by German craftsmen, Noah’s Ark, the Jack-and-Jill Slide, and the aromatic Coal Mine ride pulled by donkeys drew visitors by the thousands.