This organic farm close to the Pudong airport has tomatoes in season that you can pick and cook. The organized itinerary goes from 10am-4pm, where you can pick between a planting workshop or tomato gratin cooking class. You also get a farm tour, and can pick your own organic veggies on the way out. They recommend wearing long sleeves, so it's probably going to get buggy and hot. That's 50-80rmb, and lunch is included. Register here.