Sister Bay Waterfront Park Location 2362 Mill RdSister BayWI54234 Next Event Peninsula Century Fall Challenge - September 13, 2025 - 12:00 am - 5:00 pm Loading Map.... Sister Bay Waterfront Park2362 Mill Rd - Sister BayEvents 45.189649 -87.121283 Upcoming Events Peninsula Century Fall Challenge - September 13, 2025 - 12:00 am - 5:00 pm