This is an action packed tour with some very early starts in order to be at the most advantageous position at the best time of day. The highlights of the trip for me was seeing the Andean Condor at very close range, visiting the Uros Islands on Lake Titicaca and, of course, Machu Picchu.
The quality of the guides was also important in making the experience so special, Chrystel our main guide was a real bundle of energy always making sure that the days were packed with as much adventure as possible. At one point in order to see a carnival parade in Arequipa we joined the procession, entering the main square to load cheers from several thousand people. Our guide in the Amazon was very knowledgeable and we saw so much wildlife both on land and on the river, much more than I expected and again at close range.
At Machu Picchu if the Sun Gate is not in cloud on your first visit then I would go for it rather than wait for the next morning when it could well be in cloud and you see little of the view. Practical advice, take US dollars in new $10 and $20 bills and back that up with ATM's, which work most of the time especially if you have both a MasterCard and Visa to choose from. Most of the hotels we stayed at on our trip were very good with decent wi-fi and the food in Peru was of a good standard.
In terms of disappointment the Nazca Lines are difficult to see from the top of a tower, you do need to view them from the air. I do understand the reason that Explore have for not allowing that option but disappointing. Finally I don't recommend guinea pig, too many bones! (DPRA -11th August 2011)