If price is more important to you than blameless service, try Terra Extreme .
Runs treks to volcanoes and mountains, including day climbs to Sairecabur (5971m; CH$90,000), Lascar (5592m; CH$90,000) and Tocco...
This is a funky cavelike spot with an intimate interior: low candlelit tables, roaring fire and prehistoric-style daubing on the walls....
Atacama Connection information
Lonely Planet review
Has bilingual guides.