I agree with Robo. I had an OLD one day pass left over from years ago when they were ALL non-expiring. Several years ago (before Harry Potter), you used to be able to pick up a 7 day pass for Universal Studios at some grocery stores where I live for $99. So, we planned a week down in Orlando around that deal. It was our first trip to Universal Studios, but being Disney fanatics, we couldn't go all the way down there and not visit Disney! So, what we did was leave Universal for 2 days to Disney, one day using that old left over pass, and then another day to do the Christmas Party (to this day, I STILL think it's outrageous for what they charge someone who already has a ticket for the party.... but if you ONLY buy the party, it's a little more palatable). We even did a "hop", spending the morning at Universal before jumping over for the Christmas party. So, long story short... I would definitely save that one day non-expiring pass for some visit that you can get a better value out of it. My story is just an example of how I used mine.