Jansen's
377 bowen st., +1 920 231-0690, (http://www.jansensrestaur...). lunch 11:30am-2pm, dinner from 5pm. a wide variety of steaks, seafood and sandwiches. considered by many to be the best tavern food in town. lunch $5-$10, dinner $10-$20.
Papa John's
Eat there at a few barren tables, or take out, or have them deliver. You can order from their web site. Within 100m of this restaurant are a dozen other places to eat and drink.
Friar Tuck's
just outside the north gate of the "North 40" campground at the AirVenture is one of the great casual dining experiences of the area. Wonderful staff, great and generous meals at a very fair price make this a Must Eat restaurant in Oshkosh.
airventure
Food courts are scattered at a dozen locations throughout the grounds. They can be broken into the "Brats and Burgers" and "Cafe" groups, each of which have similar menus. Prices are a bit inflated; a full lunch will be $8-10. All vendors operate out of stalls, and you eat on nearby picnic tables.
Vegetarian food and healthy food is hard to find at AirVenture. "Park Cafe", "Warbirds Cafe", and "Classic Cafe" offer a vegetarian wrap which is reasonably tasty at $8, but their "Chef's Salad" sadly has a stratum of ham. Pizza vendors usually have a cheese pizza option: see for example the pizza counters on the northeast corner of Hanger B and the southwest corner of Hanger A.