Looking on the internet deeply has found these results:

Are you going for a vacation is the most popular phrase on the web.

are you going on a vaction 1633,000 results on the web	Are you going for a vacation 11,150,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
Are you going on an assignment? Are you going on a date? Where are you going on Saturday? Are you going on an assignment? What, are you going on a date? Why are you going on about a Frenchman? Where are you going on honeymoon Mia?	I'll say your going as a vacation, not to study. What are you going to do on vacation? We're going on a vacation. Princess, I'm going on a vacation soon. Are you going on summer vacation with your parents? Why are you going to Aspen, vacation? Just before the conversation ended, Colonel Brubaker told you something about going on a vacation and your reaction was like you didn't understand what he was saying. Ernie, I'm not going on a vacation.

are you going on a vaction

1633,000 results on the web

Are you going for a vacation

11,150,000 results on the web

More popular!

I'll say your going as a vacation, not to study.
What are you going to do on vacation?
We're going on a vacation.
Princess, I'm going on a vacation soon.
Are you going on summer vacation with your parents?
Why are you going to Aspen, vacation?
Just before the conversation ended, Colonel Brubaker told you something about going on a vacation and your reaction was like you didn't understand what he was saying.
Ernie, I'm not going on a vacation.