You can learn more about the August 1st mystery ride by checking out the announcement:

Going Out of Business ride! A group bike tour of a failing economy....
http://www.indybay.org/newsitems/2008/07/21/18518307.php

And checking out a report by Anonimo:

"Part protest against car culture, part living art project, and part prank, the group of about 20 bicyclists visited the sites of former gas stations, drive thrus, autodealerships, and more, planting wild flower seeds, and other decorations depicting a deteriorating economy and hopes for a greener, wilder future. "Property is Theft", "My heroes carry guns in the their minds", and "Community Garden Coming Soon!" read some of the signs posted outside fenced off buildings and pavement cracking open with weeds."

Continues at:
http://www.indybay.org/newsitems/2008/08/04/18522794.php

The next mystery ride, BikeHeart -The Battle for Santa Cruz, takes place Friday, August 8th. People will begin to gather at 5:30 at the corner of Cooper and Pacific. A version of the draft notice reads as follows, "Gear up as the battle for Santa Cruz begins to defeat the dragons of excessive car parking garages while fighting for a bike friendly Santa Cruz."

You can read more and get a flier at:
http://www.indybay.org/newsitems/2008/08/06/18523438.php

...get off the internet! go ride a bike!