I just got back from a trip to Santa Cruz over Thanksgiving. I rode both the Emma McCrary trail and the Flow Trail in the Soquel Demo Forest. Both are excellent, but if I had to choose one right now, I would definitely say go for the Flow Trail. It’s 4 miles of the absolute best riding I’ve ever done. It does have a lot of climbing, but since I live in Southern CA, I’m pretty used to it.
Whatever you choose, you won’t be disappointed! Santa Cruz has some amazing trails to explore