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.
My Extreme Flight Extra 300 88" wing-span with a Brillelli 366GT 60cc Gas motor, HiTec 5955TGs all around, Smart-Fly Sport Plus with optical ignition kill switch