Most people usually just point to the stars they want a picture of or squat down and touch them. I suppose you could lie down on the ground, but it's not exactly the cleanest sidewalk in LA. For the hand prints and footprints, the same thing, put your feed or hands in them. If you know of a specific star you want to see, you could look up the location and plan something related to that person, but considering how far apart some of them are, that can be a big effort.