Free Camping Offer designed for; Michigan residents who currently own a RV and have a household income of over $40,000. Families that have previously visited are not eligible. 21 Nights Free offer valid only for RV purchases that have been within the last 12 months from Recreational Vehicle Dealers that participates with our certificate program. 1 pass per household. Includes a 90 minute tour of our Lake Shore Resort, both spouses must be present to receive.