The Last Workday before the Holiday

Use "the" in the title for the same reason you do in the text.

There a only 6six people on our floor, and everyone is slacking off a bit.

Hope I will haveI'm looking forward to a great holiday. ^_^

It's interesting that two other people gave you the feedback "I hope you enjoy your holiday" and "I hope you enjoy your break," but one suggested the alternative "I'm looking forward to enjoying my holiday" in your text. I'm not sure I can explain this, but I will try.

"I hope (you, he, she, it, etc.)" is often used when we wish something for someone else.

Most of the time we would not say, "I'm looking forward to your holiday" (We might say that if you were coming to visit us on your holiday.)

So, "looking forward to" is specific to the person who is experiencing the feeling of happy anticipation. Your colleagues are probably looking forward to their holidays as well. It's a very common expression for this situation.

The Last Workday before (going on) Holiday

There are only 6 people on our floor and everyone is slacking off a bit.

I just finished packing up my things and I am getting ready to leave work.

HI hope I will have a great holiday. ^_^

There are only 6 people on our floor and everyone is slacking off a bit.

Hope I will have a greatI’m looking forward to enjoying my holiday. ^_^

This is a more natural sentence that can be used to describe your anticipation and excitement for a good holiday!