Every time my family comes from out of state we have to go to the swap meet. They think it's the coolest thing ever. And I probably thought so the first few times too, but it's the same every time you go. Honestly I go for one thing, and sometimes I make it an in and out trip just for this... DIP! I love the different chip dips they offer at a few of the stands. Cheap and yummy and I can't seem to find them anywhere else on a consistent basis. Usually they are like 5 for $20 - well worth it.
Other than the dip, this is a good place to waste some time. It's pretty hot in the summer, so go early. You can rent scooters if necessary. The food lines here are crazy long, and nothing here I would really recommend eating (shady snack bar with beer).