Reporting my first run through each...
B500 - E46 M3 (Heidi)
Positano Full - 6:32.768 (cert)
Fujimi Kaido - 8:40.130 (cert)
Nurburgring - 8:27.100 (cert)
Driver's Notes:
Positano: HOLYCRAPTHATWASFUN. This really felt like Targa, especially considering I have the least track knowledge - I really had to drive what my eyes could see, not what my brain expected.
Kaido: Boatloads of wheelspin on the first half of the uphill - there seem to be a lot of mid-corner bumps (perhaps I'm hopping over road camber?). Also harder to keep it clean here; I stuffed it three times before I got a wreck-free run (plus one time I clipped the wall and decertified. Once I got over the top of the hill, it was smooth, clean, fast sailing. That said, I did cook the tires a bit

Nurburgring: It's the Nurburgring. Not much else I can say - I love it, Heidi loves it.