The Floating Cabana - would be awesome at the lake! I need this and someone to blow it up;)
Baby mop outfit - file under the 'need in our lives immediately' category...
The Underwater Jetpack
Shoot through the water faster than Aquaman with help from the underwater jetpack. They strap around your wrists and propel you through the water so you can explore deeper and further than you normally could while snorkeling or scuba diving.