The New Tug's First Time in Grand Traverse Bay! The new tug's first time in West Bay. Skyler, Sarah and friend David joined us for an afternoon trip to Power Island (also referred to as Marion Island). We put the boat in at Elmwood Township Marina, their facilities are exceptional. It was the perfect day for a cruise and lunch at the island. Power Island is a 202 acre property located in the west arm of Grand Traverse Bay. It's approximately nine miles west from Downtown Traverse City and is a favorite spot for boaters to congregate on a hot summer's day.