What are some of the food offerings? What would be a ballpark figure for a family of six or eight, to get some food, at the drive in?

Bring a cooler

Go with the pizza it's a good deal and it's good

I'd pack a cooler. But they do have good food. :)

Chilly cheese nachos, tenderloin, bring your own drinks to save money. So less then 40 dollars for my family of 4

Well for a family of six or eight I'll say about $50.00 for food and drinks. They sell pizza hot dogs nachos French fries etc.