Then, of course, we didn't really know what to do with it. After all, when was the last time you were visited by an alien?
I mean, obviously we had the problem of finding somewhere to park his/her/its vehicle. After all, this is rather a quiet suburban street where one of the major preoccupations of everyone is complaining about some of the neighbours parking their cars in the wrong places and causing inconvenience to the rest of us. So you can imagine the number of problems that an interplanetary craft would cause.
Luckily, however, when the problem was explained to him/her/it (it did - once we got to know each other a bit better – show us its genitals, in the interests of science, obviously, but even that left us none the wiser) helpfully park it in orbit around the moon for the duration of its visit. That was, we all agreed later, something of rather a good idea and we are seriously considering bringing it up at the next local council meeting when they discuss the town centre and its interminable traffic problems.
Although, admittedly, it will be a long way to walk to get to your car, especially when carrying shopping, as Earth technology currently lacks the remote parking and manoeuvring technology that the alien used to park its ship. However, we feel that is a mere detail that willing minds could soon overcome.