Your tips - During the weekend there are different squares in Lima, where house maids and also some restaurants hold stands with very good food at extremely reasonable prices. Try to ask your hotel when and where. - Visit the ruines of Pachacamac 40min driving from Lima, very nice and interesting place. Close nearby possibility to see the peruvian "paso" horses show and try good country side restaurants. - Dont miss the nightlife in Barranco, good bars and wide selection of cokctails made with Pisco and exotic fruits. - Visit the Lomas de Lachay (only seasonal during winter and spring) truly a little heaven in the coastal peruvian desert. A bit far away, but there are organized tours.
Usually Lima is not really considered on the tours going to Peru and is just a place to catch your next flight to Cuzco, Titicaca lake, Jungle excursions, etc. Well, I think it is worth to spend a few days there and explore the city. Althought a bit chaotic, Lima has a lot to offer in terms of sighseeing, culture and food tasting. There is also a vaste offer of peruvian handycrafts from the different regions. Dowtown Lima is a Unesco site and for sure it's a must to be seen.