The Aqua Grand Inn Invites you to stay at Mackinaw City's only hotel with an onsite indoor water-park and largest spa in Mackinaw City - room for more than 25 people! This Brand new facility has over 5000sq. ft of Great Family Fun?featuring water cannons, geysers, dump buckets and much more. Over 1700 gallons of water spraying each minute! The Jacuzzi contains more than 10,000 gallons of water. Start the morning right in the Brand New Breakfast Room? Fresh Hot Waffles and Dunkin Donuts Coffee included.