Pretty much all I've ever wanted to do is walk down an up escalator (and vice versa) at just the right pace that I don't move. Then run a bit faster, slow down a bit, etc. All my earthly ambitions boil down to this.
Now that you mention it, escalators don't thrill me anymore, but walking quickly with those long moving sidewalks at the airport is still stupid fun at 41.
Travelators (is that what they are called?) in airports always get me going. Walking the wrong way on themmoon strangely fun. Moon walking for the guy who can't dance.