Ever heard the saying "Got it made in the shade"...Yes? Well, keep that in mind when metal detecting tree lined parks. Pay attention to the side of the tree that casts shadow during the hottest part of the day!
Notice anything interesting about the above picture? Yup. all the people are sitting down and relaxing in the shade. Not one sunny spot has anyone in it. When I was in law enforcement, we would call that a clue!