2 June 2011 (-1 in time zone):

For a fee, you can get your passport stamped here, but I thought that was silly. So I mailed a postcard instead, which has the very touristy One Foot Island stamp on it, but at least it's a ligit use of a stamp.

Rough notes:
http://mandarinmanmarktravelnotes.blogspot.com/2011/07/2011-nz-to-sf-day-20.html