Near Greenfield park sits Mr. Picnic. Although they are known for their catering, they have opened a little cafe near 124th and National. It is only open from 10-3, but they have the ingredients for a great picnic. Their sandwiches are delicious and there are drinks and chips, sides, salads and desserts available as well. If you want to take the kids out for a special lunch, pick it up here and then head to the park!