OK, being from Wisconsin (the land of the "great lakes") I was COMPLETELY surprised to be told that, yes, there are lakes here in the desert of Arizona. The Lake, Saguaro Lake, is a man made lake originally built as Stewart Mountain Dam...even so, its beauty is equal to those you would see in the glacier regions of the Midwest. I was amazed, frankly, at how beautiful this tour was. Sold for $18 for 90 minutes, you get your money's worth. But that is probably not what you want to hear...
The "event" is a combination of 1) the scenery, and also 2) the charm of the paddle boat itself. The boat is quite large with seating for probably close to 75 people! It's an event that you could share with family, but I happened to be there with friends. Currently, it's a pretty mellow type of event (great for Mother's Day!), although I am told that they are hoping to exploit its benefits to include comedy shows, Jazz ensembles, stargazing, and a variety of other events.
P.S. They also advertise that you can rent the paddle boat for company picnics, weddings, and the like.