I am conducting research into the happiness generated from a challenging but rewarding holiday as part of a postgraduate psychology project.
I would appreciate your help in doing this. It would involve filling in a short questionnaire (5-10 mins) a couple of weeks before you travel, at the end of the day you reach Machu Picchu and again a couple of weeks after you return.
In return for your time you can choose a free gift (a squishy travel pillow or a pocket torch, either should prove useful).
Please e-mail me if you wish to help out, including your tour code and departure date.