The Gee Willikers is easy to build and fly.
You can download the drawings of this RC aircraft model, print them, cut and assemble an airplane model for the evening.
The Gee Willikers has flown, and goes well on two cells outdoors; have not tried it from water yet, still 'splash-proofing' the electronics as well as I can.
The biggest "original footage" RC plane crash compilation on YouTube, comprising 10 years worth of crashes from the XJet channel all rolled into a single video for your enjoyment