Yo St. William Deano; The closest will be the most cost effective and good too! You never said what activities you planned to do. With a season's pass. As you live in St. Williams, the closest place to you on the sheltered inner bay, in my mind is going to be the cheapest. The quickness, you're 5 minutes, of access makes shorter trips worth while , the large diversity of fishing /recreational opportunities through the seasons and weather conditions would greatly increase the number of trips and time on the water. With your gas savings it should make it cost effective enough to access all the other good spots on North Shore when it suits you, the fish and the weather.
PS. Pike and perch start any day now.