I was gonna make this just about the one that I want, but figured anyone else could join in. What I want is a piece of technology only an advanced civilization (thousands of years ahead of us) could have. It' is where you have 2 1.3 foot long kinda bar things like the size of remote controls.
You put one in each hand, and then you thrust it and you fly with them.
You steer by thrusting the bottom.
Obviously it is possible.
It is just taking very condensed energy pellets, and the right technology to boost you off the ground. We are only 1/1000th into what is in store for reality. We could even design billions of advanced nano robots. It just takes sophistication.
I would love to have this technology. It would be a dream come true, to instantly fly, wherever you want. Up to mountains, between wide branches.