Ideally situated at the mouth of the St. Johns River, Morningstar Marinas has everything you need to make the most of your time on the wIdeally situated at the mouth of the St. Johns River, Morningstar Marinas should be your launching point for any fishing adventure or ICW cruise. Our experienced crew will have your boat fueled, stocked and ready to go.ater. Whether you're setting out for a day at 9-mile reef or cruising the ICW, our call-ahead concierge service will have your boat fueled, stocked and ready to go when you are.