Here is another quick design. I've changed computers , I'm now using a Mac with I don't feel is as accurate so there will be less detail until I can find a way to improve things.
Anyway the circuit is clockwise, the short circuit is just on 1.5 miles 2.4km, the perimeter circuit is just under 2 miles 3.15 km with the full circuit at 3.1 miles just under 5km.