Well, here's a few from around 1979. If you look REAL hard you CAN see boats. As I remember, these were taken on a big holiday weekend (Mem Day, 4th, Labor Day). These were taken down at what was known as Bluewater Marina (where the casino is now). Back then, you just pulled your truck up alongside the river, maybe put up a tent, and partied.
There's a reason croche'd (?) bathing suits never caught on. Yup, it's the first wife.
http://www.vintagerodcomponents.com/boat/neg48.jpg
Never really was a traffic problem on the water back then....
http://www.vintagerodcomponents.com/boat/neg50.jpg
Probably headed to Fox's, Sundance or (later on) The Rock Palace after this was taken
http://www.vintagerodcomponents.com/boat/neg44.jpg