Does anyone know of an easy to fly plane on floats without going to a lot of trouble?

I fly a GWS E-Starter on GWS Floats. The E-starter and I think the GWS Beaver both have mounting slots for the GWS Floats, so there isn't any modification to do. You just have to assemble the plane and assemble the floats.

Where could I get a GWS Beaver, and floats?

www.hobbycentralrc.com carries both, but I think their floats are out of stock. I got my floats from www.e-flightline.com

or you could make your own Beaver on floats!