There's your average gadget-toy Christmas presents like an iPhone controlled helicopter or a rolling robot camera, and then there's a jetpack. Firebox have put the JetLev Flyer up for pre-order, which propels you 10m high at up to 22mph just using water.
Eric Scott aka Rocketman is probably the best Jet Pack pilot the world has. He's flown over canyons, performed in airshows and holds the record for fastest speed on a Jet Pack. So with that gift, he's now teaching people how to fly in his Jet Pack school.