I prefer to use...........
.............North Wales for my track days.
Head off through the Denbigh moors at legal speed,,,,,,,,,,no coppers about,,,,,,,,,,,,,so hell for leather back the other way. Start at the Sportsmans Arms pub and there's at least 4 miles of road to use. On most of it you can see that nothing is coming the other way and use the whole width of the road. Back and two half a dozen times then off to Lake Brenig for a cuppa.
The goody two shoes types here won't be interested but the real bikers will love it.