I'm thinking east-west from miles 24-28, NW 193rd St? If so, then I was very frustrated, not really by the hills, not that they weren't "fun" but, at that point I was riding with an inconsistant group that would attack the hills and coast down the other side. They played leap frog through that section passing me on the ups and slowing me down on the other side.

A few tips to anyone who cares:
When doing a large group ride, try to get into a group that you can actually work with. If you aren't strong enough to maintain the speed (or effort) when you get to the front, then stay away from the front. If you find yourself at the front, maintain speed and get left as soon as the rider in front of you goes backwards. Then sit in the back surfing wheels if you have to.

Do not ride a TT/tri bike in a group ride, unless you are going solo, willing to pull a train along or sit off the back STAY OFF YOUR AERO BARS!!! (Some people around me were *****ing at one guy who was riding alongside us on his aero bars and trying to slide in, not a good way to make friends.)

I think I had more but, my 3rd graders homework has distracted me.