You can show just how thrilled you are about your vacation while still providing an apology (of sorts… not really).
Example
Hey there — I’ve got good and bad news for you. Let’s go with the bad first.
The bad news is that I’m out of office. The good news is that I’m out of office and enjoying elotes in Cancún.
If you can’t wait for a response, my colleague will be happy to take care of you. Just email them at someone@example.com.
I’ll be back on February 7th.