Nürbürgring: pfew, first part, actually from Hatzenbach till Fuchsröhre, Kallenhard, first the left-right, try to take that one full speed, then the quick right hander immediately afterwards, and the part I love most is from Hohe Acht to Brünnchen, really love to drive that part. It's a hard part of the track, very technical, but so nice to drive through.

Pflanzgarten is also one of my fave parts, this part is harder in GT5 than in GT4, especially with higher powered cars like the Minolta Toyota, it's not as easy anymore to go flat-out there.
Suzuka: S-curves, Degner curves
Deep Forest: First corners of the infield part (right corner going into the short tunnel).
Grand Valley: The S-bend just before the tunnel (but then the GT3 lay-out, loved to drive the Grand Valley Reverse with sunset, such beautiful scenery, especially in these two corners).
Monza: Variante Ascari, love to accelerate out of the corner, slow in, fast out, hehe.
Cape Ring: The S-bends after the first hairpin, especially the last one, the quick left-right combination.
Le Mans: Ford chicanes, Porsche curves, though I still dunno how to perfectly take them, always lose too much time there.
TGTT: Follow Through
Laguna Seca: Corkscrew
That's about it I think.
