I'm not sure how. I've visited OKW before without a parking pass to eat at Olivia's. (I know, not a hot dining destination, but I'm a sucker for the blackened grouper sandwich.) I happened to be staying at Bonnet Creek this past July, explained at the guard shack that I was hoping to grab lunch---no ADR, just walking up. After briefly flashing my drivers license I was waved right on through. I wasn't given a temporary pass, and the guard didn't write down my license plate #. What's more, no one actually followed me to be sure that I actually *was* eating lunch at Olivia's.
However, I did, and it was lovely. The weather was cool enough to sit outside, and we had a wonderful lunch away from the hustle and bustle of the water parks, where we had spent the morning until about 11:30, when it was clear it was about to reach capacity.