RedactedNarrative: Operator of Watercraft #1 was towing a wake boarder. The wake boarder fell and the operator of WC #1 was attempting to turn around to pick up the wake boarder. At this time, Operator #1 was unable to see Watercraft #2 because of the sun setting and producing glare on the water. Watercraft #2 was inoperable due to mechanical issues and was drifting. WC #1 drove up onto WC #2. No injuries occurred. There was damage to both watercraft, and WC #2 was a total loss. Life jackets were not being worn in either craft. Alcohol was not a factor.