I have had numerous memorable rides ... it's almost hard to pick the most memorable one!!
Many of my rides have been written up here:
http://www.machka.net/, and I'm working on getting more of them there.
However, my most memorable ride would have to be Rowan's and my wedding century!! In the early part of the day, before we got married ... we rode a full imperial century.
If you scroll down there's a description of that century here partway down the page here:
http://www.machka.net/2008/MiscellaneousMeanderings.htm
And on the page that describes how Rowan's and my relationship developed, I also mention the century there along with the wedding ceremony:
http://www.machka.net/aboutme/rowan_charlene.htm