BRAINERD, Minn. — Sunny skies and temperatures in the low to mid-80s are perfect weather for Minnesota visitors and residents alike to safely get out on the lake and have some fun. But when they do, they are advised to use caution as water temperatures are still quite cool at this time of year and to make sure everything on the board is in working order. As boaters prepare to take their boats out of storage for the summer season, Jim Guida, a Mi…