6 June 2011 (-1 in time zone):

I eventually did get the opportunity to snorkel over to one of the islands. There were some larger fish in the deeper portions of the channel, but it didn't get that deep and is just about walkable at low tide.

Rough notes:
http://mandarinmanmarktravelnotes.blogspot.com/2011/06/2011-nz-to-sf-day-24.html