Carretera Central, or the Central Highway, is my favorite. You can spend a relaxing and sedate weekend or weeks in Chaclacayo, where there are several restaurants Cecci' Pizza is a good place to wine and dine. Chosica, or Santa Eulalia, accessible on the left just before the bridge to Ricardo Palma, is a narrow valley of apple and avocado orchards, even several stone ruins further up the valley and, now, lots of restaurants and riverside picnic grounds. Back on the Central Highway, there are several restaurants further east at Ricardo Palma – some of the restaurants have playgrounds that reach the river.
For a more adventurous day, pack a picnic lunch and drive further up the valley – the scenery becomes more dramatic the higher you go. There is access everywhere for good walks and for mountain bikers.
For those who enjoy driving , you can easily reach the highest point of the highway, at Ticlio, as a day trip.