Hope you read my feature on wild edible foods and how to enjoy them. If not, check it out here. One of my favorite wild foods are mulberries. You can find mulberry trees growing along Calumet Street and the Olentangy Greenway Trail north of the entrance on Northmoor Place.
Make sure you know what you're eating. Once you've gathered a quart or so, enjoy them raw or in milkshakes. I also put them in a salad of field greens or, in the morning, add a bunch to a bit of heavy cream.