The Hydro-boat-car-airplane-lawnmower-helicopter 
 
If you haven't seen one of these before, prepare to be amazed.
(sorry about the music, but it was mixed in with the original audio track so I left it as it was)
Pretty cool, eh?  And did you catch the spots at the end when it was hovering in the oncoming breeze, adding 'helicopter' to its vast repertoire?  (One of the sites below mentions "sand and snow", so I guess we can add "dune buggy" and "snowmobile" to the list)
Aerodynamically, what amazes me is how maneuverable it is with what little wing surface it has.  But it certainly seems like it's under fairly tight control.
I haven't actually researched this thing, but from glancing over the page where I got the above video, it appears there are a few to choose from:
  
And one big plus point is that they don't cost very much, compared to jumping into the field of normal R/C planes and expensive control boxes.  So when if you pile the rascal up, it won't be a wallet-killer to replace it, and it also gives us the luxury to try a different brand if we're not happy with the first one. 
On the other hand, if the above is too mechanical-looking...