<human>: The other day I was thinking about my death. I'm 19 years old so unless something unfortunate happens I've got a long life ahead of me. I started thinking about ways that I could make my death less of a negative memory for my future family, and I decided that a scavenger hunt (Think National Treasure, sans Nick Cage) would be a fun way to pass down some of the best memories of my life.  
  
I plan to leave a letter for my favorite grandchild, for them to open on their 19th birthday. (This part could be changed to take into account that maybe I'll still be around then) This letter would contain instructions for them telling them that I've left something behind for them, and give them a clue as to where they should look. Each location would contain either an item that would help them open the next clue, or a puzzle they would have to open to get the next clue. Eventually this would lead to a time capsule containing important items from my life (important photographs, mementos such as my old Polaroid camera, a handwritten copy of my novel) and some heirlooms to hand down (jewelry that can be passed down from my granddaughters to their daughters, etc).  Finally, I would leave another letter in the time capsule giving my farewell to everyone and instructions for my family to leave their own important items in the time capsule and for my grandchild to leave the same challenge for their own grandchild when the time comes.
  
What I want to know from you guys is: what kinds of puzzles can I incorporate into this grand adventure for my posterity, what items would you put in the box if you were creating your own time capsule, and what is the best memory you have of your grandparents?

Can you condense the text into a few key points?
<bot>: Someday I will die, I want to send my grandchild on a massive treasure hunt full of awesome puzzles and shit.