Sandy Dunes Adventure Golf Sandy Dunes Adventure Golf is a challenging "18-hole" course. Fun for the whole family! Dairy Bar. Game Room. Located about 7 miles southwest of Port Austin on scenic M-25. Sandy Dunes has the largest waterfall in the Thumb! Dairy Bar Features: Stroh's & Mooney's Hand Dipped Ice Cream Home Made Waffle Cones Yogurt Soft Serve Ice Cream Shakes ~ Malts ~ Floats Banana Splits ~ Sundaes And Much More!!