Here is a little trick. I find the best time to go venture outdoors is on lunch hours. The second trick, I got to softball or little league fields, you have dirt and grass available. lastely, when the seasons over you don't have to worry about anyone hanging out on the fields. It's all yours... Oh, and take a duffle bag with a lunch. If someone does show up. Put the stuff away and kick back to eat lunch. LOL
