I remember these visits in Belfast. President Clinton dropped in a couple of times to offer support for the political negotiations that were taking place in the late 1990's. His security people insisted on shutting down most of Belfast and it was almost impossible to move.
Clinton made a number of public appearances - including turning on the lights on Belfast's Christmas tree, so people got a chance to see and hear him. There are no details of President Bush's schedule, but I doubt he will be meeting the public.
All in all a good day to sit on the balcony with some beer, some ice-cream and a good book.