Sterile transit is not quite as easy as in major European airports - you can't just go from one gate to another. Upon deplaning, you will be herded into a corridor leading towards the immigration and customs area. However, you will see signs for diverting to connecting flights to the U.S./international. Ask the agent meeting the flight when you get there.

Should be no problem getting out and coming back in (but keep your inbound boarding pass to save on airport taxes). Not much to look around outside unless you head into town.