Just follow the cyclists and ride around the park. There are actually several elements missing present in most city grid streets. Warning. Neither Copenhagen nor Portland will be of much help to you here. There is one really obvious element missing (that I will base my next discussion on here). But you may find one missing element or two that I have not thought about. For now, just stay on the loop. Once you think you know the obvious element that is missing, branch out to the next parallel loop of surrounding streets (or alleys) and see another surprise.
The way I was taught to read "great design" in school was to start with what was missing. It always stunned me what other people observed about good design. I hope the same can be true of the blogosphere! Happy sleuthing.
I practice architecture and urban design in Charlotte, N.C., often as a consultant in transportation projects. The rest of my time I help layout the developments of the clients of the firm I work for. While I'd like to be an urbanist, if anything, I'm an expert in the layout of parking lots. For now, just consider me an "aspiring urbanist", until governments allow me to practice what I preach.