The pad at Landing Zone 1 (Former LC-13 at Cape Canaveral) has a big giant SpaceX logo consisting of a stylized X.
SpaceNews reposted this picture of a guy on the X marks the spot, as distributed by SpaceX.
How close did the landed first stage, on Dec 21, 2015 (Orbcomm OG2 mission) come to the X?
This is relevant, since the X on the ASDS barges is a smaller space so accuracy in hitting the target matters.
On the NasaSpaceflight.com forums, there is a running Barge Landing Bingo thread, where the have divided the surface of the ASDS into a grid, and allowed people to pick grid coordinates to predict where the first landed stage will touch down. It looks like the LZ-1 landing was sufficiently unexpected that the LZ-1 Landing Bingo did not happen.