Peter I Island: I think most if not all of the very few activations (Wiki says three, I only remember two)
In addition to the 2006 3Y0X activation, there was one in 1994 by 3Y0PI, and a 2 man activation by 3Y1EE and 3Y2GV in 1987. That last one was active for about 10 days and made 17,000 QSOs.
http://hamgallery.com/qsl/country/Peter1_Island/3y1ee.htm73 John AF5CC