I know that dolface and 46x17 won't be able to make it on friday, is there anyone else who would object to a friday ride? This is x-mas eve, so you probably have off work/school.
FYI, the route for this ride will revolve around the different slides in SF. These are concrete slides that you need cardboard to slide down, it's pretty fun and there are enough of them scattered around to make a decent route I think (although Blast Radius needs to show me where Acme is).