Traveling is an experience that will not only teach you about different cultures and ways of living but also allows you to appreciate your own life in a different way after traveling.
Bring a reusable bottle that you can take everywhere during your trip - you can get filtered water at most hotel restaurants for free.
Make time to visit Lima, it has a lot to offer especially in the culinary scene and you will generally have to go through it as a stopover.
Keep local currency with you to tip guides, drivers, and for any small purchases.
Wake up early to take advantage of your time while traveling. You can rest when you are home!