Huacachina is a coastal desert located in the Ica region. It holds one of the few oases in the whole region: a blue-green lake amid huge sand dunes under a beautifully clear sky. Take a dune buggy so that you can ride all over the dunes before riding a sand board down. This is the definition of a touristic little town, and it is definitely worth a visit. You'll find some nice hostels ands lodges where you can stay overnight right in the middle of the oasis. Huacachina Oasis is a short four-hour drive from Lima, and there are also plenty of buses that will bring you here.