It's a rickshaw. Or... jinrikisha, I guess.

[From the way he says it, it's probably kind of new to him too.]

It's kind of a novelty, but it's also a pretty cheap way to get somewhere if you don't want to walk the whole way.

[He'll grab the handles and start moving... just an inch, then he glances back in surprise. Wait a minute. How much could a kid that size weigh...?

... Well, it's not like it's unmanageable, and after that false start, he gets moving.]