Such a simple thing, but a little hand painted stone (painted by you of course!) could be such a gift from the heart and costs next to nothing! (nothing if you already have a bit of acrylic paint and (Diy Garden Rocks)
One of my favorite parts of summer with my kids is indulging in old timey Americana-style games, like hopscotch or croquet. Never before have we been able to play skee ball at home, though; it always required a trip to the arcade.