Last minute rides

Is anyone from the City area up for doing a ride in Richmond Park tomorrow (Friday)?

Here's the catch: I arrived here yesterday from Toronto and just got my road bike re-assembled. I'm staying near Monument tube station and I have no idea how to get to Richmond Park (no GPS on my bike). More importantly, I've never ridden on the left-hand side of the road and I would feel more comfortable getting there with other riders. So if someone wanted to ride there from City, I would be grateful for the help.

When are you looking to head down there?