Self driving to the spectacular and less known but fascinating  North Peru Cultures, very different to the ones in the south.  
We can design with you the sites you would love to visit, and the duration of the trip. 

For instance, starting in  Lima (as alternative you can fly straight to Chiclayo, to shorten your trip), continue along the North Panamericana highway to visit Caral (the oldest ceremonial city in the Americas). A possible side trip from Casma to the east would be a visit to the Sechi temple, representing an impressive massaker, with Chavin influence, Otherwise, continue to the beautiful Trujillo colonial city and the nearby Mochica (Huaca de la Luna) and Chimu (Chan Chan) culture monuments,  then to Chiclayo and the spectacular Tumbas Reales Museum with the incredible treasures of the Sipan King. For nature interested passengers, we can include the Chaparry nature reserve, a sanctuary for the Spectabled bear, the white winged turkey and many other species, Crossing the low Andean pass, you would arrive to the amaizing Chachapoyas culture (the fearsome warriors of the clouds), boasting very particular monuments (like the Kuelap fortress, called the Machu Picchu of the North), and the Gocta waterfall in the high jungle, to continue to Cajamarca and Cumbemayo channels and stone forest. Back to the coast , possible drop off in  Trujillo. Or may be continuing to Huaraz, enjoy the views of the White Range (Cordillera Blanca), the Llanganuco lakes and the very old Chavin ruins temple, returning to Lima in about 3 weeks.