You are going to love Colombia, I am sure, and especially Medellin! I have been living here over 3 months now and wish I didn't have to leave. Be sure to get up to Parque Arvi on the Metro Cable (I call them the bubbles). The view is magnificent!

One thing I need to disagree with you about is leaving the cell phone behind. I use my smart phone (Samsung Note 3) instead of a camera (It takes great photos) and it is much lighter than the printed materials you list above, all of which can be accessed on the web with the phone. My data coverage doesn't cost me anything down here, although it's a little slower, and I have a connection even when wifi is not available.

Enjoy your trip!
(...and I will be posting more about Medellin if you'd like to follow me at: https://steemit.com/@synchronicity)