I would tell him about your vacation and ask him if you can be put on antibiotics to clear up the infection until after the trip and then schedule it to be done upon your return.
Of course, he may need to rule that out for a medical reason... or that may not be a possibility because it would not alleviate the pain if it is the impaction causing the pain and not the infection with antibiotics alone.
I would say try (and maybe you already did this) talking to him about what is going on right now in your life (ie big, long planned, expensive vacation plans) and see if he (or she) feels that you would be able to safely wait out your return on antibiotics and or other meds.
If they feel that is not in your best interests...then maybe see if they could bump you up a day or two?? The more time the better as far as healing will go. And having a wisdom tooth pulled stinks...I had it done...but it is not half as bad as what I imagined it to be.
I think I could have gone to a park the next week with no problem (other then maybe not wanting to dine on any nachos

)...however, I remember having follow ups to get stitches out...make sure you check that you could have your stitches removed before travel. Also, double check about using straws. I know you cannot use them right after...I don't remember how long that is prohibited.
Our babysitter went to the zoo with us (and we spent all day from 10:00 AM until 6:30 PM there) the day after she had her wisdom teeth out. Me, I curled up in a ball and sipped shakes for at least 3 days straight. I am a wimp though. TOTAL mouth pain wimp!
It's a real bummer that this happened to you right before your trip. I would ask the oral surgeon this question. Pixie dust headed your way

!!!