Todd Rundgren, who lives on a 5 acre spread near the North Shore of Kaua'i, celebrated his 60th birthday this year by inviting anyone with airfare and $300 to pitch a tent on his land for a week! He called it "Toddstock".
Interview here:
http://seattletimes.nwsource.com/html/musicnightlife/2008035069_todd070.html