Most Inspirational Moment
The Inca Trail. There are some breath-taking views (not to mention altitudes!), which are simply stunning. The second day is the toughest, with 1200m of ascent and 600m of descent from a base of 3000m above sea level. The third day of the trek was my favourite - has the best scenery and the campsite was perfectly placed to watch sunset, stars and sun-rise (cloud permitting).
Thoughts on Group Leader
Wilfredo, our group leader was excellent. He was really supportive and took care of us brilliantly. He gave us lots of information and insight into local culture. He also managed to organise around unexpected events and ensured that everyone completed the trail - showing real concern, when a couple of our group were struggling or ill.
Advice for Potential Travellers
Be prepared for a fairly full-on trip, from the moment you arrive in Lima. Consider booking an airport lounge at Madrid for the 3h stoppover - there is very little at the terminal (Starbucks and Burger King only) and most of it was closed.
Also consider booking an extra nights accommodation in Lima for the start of the trip - you'll arrive early morning and check-in isn't until early afternoon, so after a 20h+ travelling, you might appreciate the shower/nap!
Pack as light as you can. There are opportunities to do laundry (via the hotel in Cusco) after the rain forest and after the Inca Trail, so 6-7 days worth of clothes is probably enough. Take plenty of layers and don't worry too much about taking snacks from home, as you are given snacks on the trail and can buy them before the trek in a supermarket near the hotel in Cusco.
Do bring US dollars to exchange, but if you have a good bank card, you can also withdraw cash from ATMs in the cities. About $500 is probably enough per person, depending on how many souvenirs you buy! Leave some shopping until the final days on Amantani Island, where you can buy crafts (mainly knits) made by the family you stay with, and which are probably more genuine that the tat in Cusco market!
Walk at your own pace on the trek and you'll be fine. The 2nd day is tough, but any one with the right attitude and reasonable fitness would make it. Do take well-worn in walking boots/shoes and walking poles are a great help (there are opportunities to buy extra kit in Cusco and before the trail).