Well, your ideas about a reading group are right on. I've been "leading" one for about ten years now. We typically get together once a month, and the length of the readings are based on the relative density of the book.
I like the ride idea. The steel industry provides both limitless material and destinations. Given the growth of urban farms, there's a lot of ideas there, too. Obviously, there aren't books on Pittsburgh's urban farms (yet), but perhaps working with the proprietors, you could work out some sort of book/destination combination.