Either currency will be fine, as US dollars are widely accepted. If you use dollars you might find it easier to keep track of what you are spending but on the downside you will probably pay a bit more for things, as people will tend to round up prices. I used a combination of the two when I went, using dollars for larger purchases and Peruvian sol for smaller items.

Kind regards

Olly, your editor

Have a lovely trip.

Many thanks for your replies, they have helped a lot. Looking forward to the holiday.

Best wishes

Kedgeree