A lot depends on the kid's age and ability. Make sure they wear protective gear like knee and elbow pads, and a helmet. I don't think skateboards have ever gone out of style. They keep getting more high tech.
Buy some pads to go along with it. They came out late for me but I have been on one and scooted around a few times. We have a picture with the littlest grand-baby and me on one from about ten years ago too. Going down the driveway of course, nothing too crazy for us.