Beautiful 780-acre lakeside setting with 7 miles of trails – a north woods experience close to home. Non-profit environmental learning and conference/retreat center on Grindstone Lake near Sandstone, MN. Meeting spaces, lodging capacity for 160+, meal service, as well as team-building, challenge or naturalist programs for any size group. Also offering nature-connected, all- inclusive adult, family and youth ‘getaways’ such as our Women’s Wellness & Adventure Weekends, Winter Family Weekend, and summer camps.