4. Beacon Food Forest
OK, this is technically not a park, but it's a cool enough open, public space that we had to include it on this list. Located on the top of Beacon Hill, this urban food forest is a woodland setting that sustains edible plants, trees, and bushes -- and all are welcome to eat the food straight off the plants. Which is the COOLEST THING EVER. With fruit-bearing perennials -- apples, grapes, plums, pears, and more -- plus nut trees, berry shrubs, and garden plots for vegetable growing, there's plenty to eat, right off the vine or branch. So grab an apple, meet your neighbors, and if you've got a green thumb, get in the fields and help out the nation's largest forageable space.