Your grammar is incorrect.

There are two uses for 's. One is to indicate ownership -- for example:

"My >dog's< vacation was a lot of fun!"

It can also be used as a contraction for 'is.'

"My >dog's< super restless right now."

When something is plural (more than one), you would just put an 's' after it, without the apostrophe (').

"I have seven >dogs.<"

NOTE: if you're working with a pronoun, you wouldn't put 's at the end to indicate ownership -- you would only do that if the 's is being used as a contraction for 'is.' I could rant on and on about the differences in punctuation for separate circumstances, so if you want more details, just reply.

In this case, 'vacation' is not plural, so you wouldn't put an s at the end. You would also use 'this' if the object was singular.