In reply to mugglewump:
We went back in November .
We took 12 quickdraws (used less than 10 though) and 60m rope. We climbed in the Arico gorges and up on the volcano.
There are a few routes were 70m is needed but as we only had 10kg bags so we didn't take it to save weight.
The climbing shop in Arico has everything you'll need, guide book, chalk etc. You can hire bouldering pads as well for 11e for the first day and 4e for each extra day.
Cheaper to pre book a hire car online than getting one from the airport.
Pete