wouldn't see anywhere else.
How to get there
If you were to do it on a budget, you can probably get a taxi to drive you both ways and wait for you while you are there. Based on other trips that we've taken around the city, you could probably get away with 40-60 soles ($15-23) for the round trip + waiting time. The entrance is additional 8 soles ($3) per person.
Alternatively, if you want to have a tour and a little less headache about negotiating with a taxi driver, you can take one of the many organized tours. In our case, we walked in the office of Alegria Tours, an agency right across from the bus terminal, and with no real negotiations got a private tour with a driver and a guide for the price of a general tour. I don't know if we got lucky or if it's something that they do regularly. It cost $40 for the both of us. Considering that most websites advertise this tour for $30-55 per person with a group, I thought this deal was good enough.
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