This is something that always sounds appealing to me, especially after watching 'into the wild' a few years back. I've never really felt strongly connected to other people through anything but nature I feel a huge affinity for and I often get bursts of enthusiasm to do the year of Thoreau in Walden, although I inevitably get stuck with finding a place to do it.
The closest I've come so far is the last 6 months, where I moved to France for university - I've spoken to my parents maybe 3 or 4 times, and even less to the people I would have called friends back home. The funny thing is, as soon as I could speak the language I realised I was living the same life here, just with different people playing out the characters. Oh well, I've got 6 months free now to travel, so maybe along the way I'll just disappear somewhere to live my Walden year