Adventure Discovery Tours, offers three different types of San Juan River adventures. They are the Sand Island to Mexican Hat stretch covering 26 river miles — a three day, 2 night float. Our second option is a five day, four night San Juan River adventure from Mexican Hat to Clay Hills, a distance of 58 river miles. Our third river trip is a complete San Juan River adventure. Seven days and six nights, from Sand Island to Clay Hills, covering 86 river miles of premier southwest boating.