You state that your trip is in May, the 2 for 1 AP deal is available for purchase thru the end of May. Since you will be upgrading during your trip, I'd just do it online before you go to Orlando....... or you could do it by phone, either way you wouldn't need an actual coupon.
All you have to do is submit the code # when you go to the buy tickets page on the Universal website. Then you'd just pick them up once you arrive at the park......... We did it last year and no one asked us for the coupon when we picked ours up, since they were already paid for. There was no problem at all. MANY others have also done this.
If you need the code it is: 6106111030025
Eclpz314
As long as you purchase the tickets by 5/31/04 you should be good. The "redeemed by" date of June 30 is VERY misleading, in actuality, the passes EXPIRE June 30, 2006, or two (2) years from 1st date of use, whichever comes first! Meaning, that you can activate it in July and still be good........ it will just expire in June of 2006 not July.