David:
My parents were quite concerned when I left for my little trek into the backcountry last summer (12 days). What I did was have mini-business cards made up from a company called
Moo.com . On the front were pictures of me (on a few of my adventures over the past summer), and the back was my parents name/phone number, then a little paragraph that said: "I met your daughter, Laura, at ____ on _____ (day) around _____ (time). She wanted me to tell you she is doing great and loves you!" I handed these out to people I met on the trail who were going to be heading out and getting to a phone before I was. Out of the 10 I handed out, I think my parents got 2-3 phone calls, and then they were able to send an e-mail to my friends saying I was OK.
The packets of cards come in 100, I think, so I have plenty more for the next time I head off on an adventure!
-Laura
