Northwest Worldperks want only 30,000 miles for a Delta Airlines' First class return ticket from Atlanta to Lima this Christmas. Very tempting.

I have already been to Machupicchu a few years ago, and feel it's too early to revisit this site again. Is there anywhere else in Peru worth exploring ?. Any suggestions welcome. Thanks.

( I have already checked LonelyPlanet by the way. But would also like to hear a personal experience from well-travelled Sawatdee members as well)