1. 秘鲁境内机票是否需提前订好?
Highly recommended. Tickets could be sold out, due to high season or festivals
2. 印加古道徒步需提前订好: absolutely yes
3. 其他tour
Amazon - yes, would be a good idea. Also depends on which part of Amazon rainforest you are going
- lake Titicaca: 不用事先定; go to the Puno harbor and buy tickets from locals. Much cheaper than organized tour
See my post: