The iconic, rocky coast of Maine, filled with finger-like peninsulas, hidden coves and welcoming harbors, is one of the great treats awaiting cruising boat owners. And then there are the islands. Here’s a look at five of Maine’s most beautiful islands from New England Today. If you’re cruising Down East this summer, you’ll want to visit at least some of them, if not all. My personal favorite is Monhegan, pictured above, a small (one square mile) outpost about ten miles off the coast at Port Clyde, which is a great destination in its own right. And it has a fairly…