Explore the “hidden history” of Spring Lake Regional Park! Old farmhouse ruins. Oak restoration projects. Fieldstone boundary walls. And maybe ... the mystery hole? Explore these and other hidden histories of the land at Spring Lake Regional Park. Trek with an interpretive guide across space and time on this three-mile hike. Moderate mobility required. Cost is $12 and reservations are required. Call 763-559-6700 to make a reservation. There is a 20 percent discount for groups of four or more. This program is for ages 10+.