Here is a RC hovercraft that you can easily control over land and water. The LiteHawk RANGER comes with FPV functionality. It has two fan motors to glide across smooth surfaces. RANGERS also has a camera. The hovercraft has a centrally mounted motor that activates when you turn on the machine and raise it off the ground, into floating position.
RANGER ships with a NIMH battery and charger. You can find it here.