I'm exactly in the same boat as Perimish: I am a Magic player with a daughter who also plays Magic. We have dabbled in geocaching, but this event has got us more interested. What we don't understand is how to find the Ixalan pieces: Is it possible to search for them, or is it hit and miss?
I'm also a little bit disappointed at the presumptions made that Magic players will take the pieces or take caches. It's a good community: We're gamers, this is a game, and we just want to play.
Cheers!