If your trip to St Ignace is all locked in but your travel itinerary is looking a little empty, we can give you a few hints and tips.Plan a stop at Star Line Mackinac Island Main Dock - St. Ignace. It's one sight you'll find on most visitors' must-do lists. If you still have some space on that travel itinerary, Castle Rock and Straits State Park will keep you amused too.