Join other surf ski, SUP, sea kayak and stand up paddleboard enthusiasts for the 6th annual 13.5 mile Cheboygan Waterways Open Water Challenge, Saturday, June 30th, 2018. The open water race will take place in Lake Huron's Straits of Mackinaw. The Straits are known for great downwind conditions especially with prevailing Northwest winds. This is the Great Lakes Downwind Championship!