Not sure if this was suggested already but anyways.
I know that there is a section on the website that has information about all the streets and which one you haven't visited and such.
But I think they should implement that inside the actual game. You open up the map and areas you haven't been in will be slightly greyed out or something. Makes it easier so that I don't have to go back or tab back to that page just to check each location.
But really It's not all that important at all but just a small convenience thing.