Big flat wide-open airport. Sounds great for a PB.
What I didn't consider when I signed up (back when it was warm) was if it was a cold and windy day, like last weekend... this could actually be a hellish race, huge wide-open space with nowhere to hide from the elements.
Fortunately it's going to be 15C and Sunny! In October! Dodged that bullet.
My PB is 1:36, which I did in Whitby last year.
I was about 10 pounds lighter... but somehow my pace is still pretty close. It's not impossible, anyway...
So I have 3 pace bands prepared, one for a 4:30/km pace (sub-1:35), one for 4:35/km pace, and one for 4:44/km pace (sub-1:40). I intend to start out close to the 4:35/km for the first few kilometers, then pick it up to the 4:30/km and see where my heart rate is. If it all looks and feels OK I will go for it!