If your trip to Posadas Airport (PSS-Libertador General Jose de San Martin) is all locked in but your travel itinerary is looking a bit empty, let us give you a helping hand.Visitors from far and wide come to see Argentina-Paraguay Bridge, so make it one of your first stops after you get off the plane. Also worth checking out are 9 de Julio Plaza and Museo de Ciencias Naturales e Historia.