The gastronomic offerings in amusement parks today is enormous and far more varied than even a few years ago, offering guests a wide range from snack stands to excellent restaurants.
While families often shy away from the prices, that is not the only reason to at least partially rely on self-sufficiency. The food trend is clearly towards sustainability and regionalism—you want to know what's in your food and where it comes from. Bringing your own food in the amusement park is a good way to know exactly what you're eating.