The question is too wide to be able to answer.
'Alien visitation' is not specific enough.
There are BILLIONS UPON BILLIONS of alien species out there all with their own culture, philosophy, agendas etc. Etc.
You may as well say, 'Animal visitation.'
So it rather does depend on the species of alien and their intent.
For the sake of argument, let's assume these prospective aliens can breathe our atmosphere, or have technology that enables them to. Ditto gravity, dimensions (size, time etc). This narrows it down a bit.
So let's break it down into the reasons WHY aliens should bother to travel all the way to this particular dirt ball.
- INVASION
- TRADE
- SEX
(There are more, but for brevity's sake let's stick with those three).
In the first case, I would betray humanity, and side with the alien invaders. No point backing a losing horse. Also, they would be able to give me a lift back to my home planet.
In the second case, I would ensure any trade agreement benefits me personally financially, so I can build a huge metal castle, within which I can sit in a corner, cuddle my teddy bear and scream and scream until my face turned blue.
In the third case, I would gladly offer myself for whatever sexual activities the aliens would be up for. It's been a dry month (month? MORE LIKE DECADE).
Whatever, hurry the hell up, extraterrestrials, this planet ain't got long.
JEV