Kobe Harbour: a little less than 4 km long, anticlockwise, at least two lanes wide everywhere, usually at least 3, pits between G and F. Who knows how the track would be to drive, but looking at it from street level on Google maps, the scenery would be fantastic. It has it all: during the lap you will see the Kobe Port Tower, a Ferris wheel, a straight lined with trees on both sides, the sea, glassy modern office buildings, urban messes, monuments, boats and elevated expressways. The circuit would pass under railways and the pit lane would be under an elevated expressway like in Seattle.
The dinky chicane at F could be easily removed.