I envy you getting to see this place for the first time. I drove over Imogene for the first time in 1997, been over it countless times since. While it never gets old, my favorite part about traveling any of these trails is taking someone for their first time. You’re going to be blown away by what you see, LakeCity and the alpine loop are great places to start!
If you can make time go up and see the actual Eureka mine, it’s between Animas Forks and Silverton when your on the Silverton side. No shelf roads. But when you look at that stuff, imagine what kind of effort it took to haul all that cement and iron up there in the late 1800’s with just men mules and carts.