Mill Creek is just outside of Healdsburg off of Westside Road, just west of West Dry Creek (that's a lot of Wests). You wouldn't know the climb is back there as you have to go in quite a bit of ways to get to it (it's a nice gradual climb most of the way). It's rural residential and very pretty when the creek is flowing and in the Spring time.

I didn't find the Geysers particularly creepy. Though there have been some "harvests" raided and during certain times of the year you might want to watch out for the gardeners. If you don't mind a non team member, I might join you for part of the Geysers/Pine Flat Epic. I certainly am not ready to do both in one day.