There's a small amusement park for children off the main square in town.
And you can go to the mall. There's a movie theater there, but be warned, all the movies are in Spanish.
Rent a 4x4 truck and go see Chiu-Chiu, Lasana, and the geysers de Tatio. For around 40,000 pesos, you can rent a 4x4 truck. Chiu-Chiu is about 35km North-East of Calama. There are intresting ruins, a lagoon, and some old churches. Lasana is a beautiful canyon winding through the desert. It's green and really different. Then, a several hour drive across the salt flats and through some VERY rugged roads brings you to the Geysers of Tatio. If you camp on the NORTH side of the geysers, and come down in the morning, you can get in for free otherwise around 16,000 for a truck and four people. The geysers are at about 4,200 meters, and you hit abou 4,700 meters coming in from the north. In May it was VERY cold our water bottles froze that night solid. A very cool experience.
