Beautiful marathon to run. Maybe I'm biased because I lived there for close to 3 years but the one time I did it was was very cool. It is tough course especially having to run Doomsday at around mile 22 but despite that it was one my favorite marathons and I've ran over 20.
Don't start off to fast remember to save yourself for the second half. Practice running hills you will need it especially going up Doomsday. Make sure to fuel properly so you don't bonk in the race.