The Whitby Marathon. This is the second year of this event, I did the half last year.
The half marathon course is reasonably flat and fast, except for one exception - a short gravel trail you do in both directions (just shy of 6k on the way out, 10k on the way back). It's not a perfect PB course, but still pretty quick and not that challenging.
(Edit: I picked up my kit and there is a small change to the course... I believe the new section is as flat as the old section they took out, but I won't know until tomorrow!)
(Edit #2: done race... see race report... the new section wasn't as flat as the old section!)
The full follows the same course, but the other half has more rolling hills as it winds along the waterfront trail. They've changed a section from last year that winded through some ugly industrial, now it stays on the trail.
Last year my goal was sub-1:45 and I shocked myself with a 1:41:10... I've since bettered that in February with a 1:38:54.
New goal: sub-1:35! I don't know if I'm quite there yet, but I should be close. It still feels pretty bloody tough to run that pace for any length of time (4:30/km) but I'm going to give it a shot.