What to expect
Not an Inca city this time. Caral introduces a much earlier urban society through large platforms and sunken circular courts. Those forms deserve an explanation: otherwise you can walk past remarkable structures without understanding what they tell you together.
How it fits into a journey
Give Caral its own visiting block from Lima or Barranca. Arrange interpretation and the outward and return journeys together so that transport does not become your final unscheduled task.