Cusick Creek road has all the rocks you could ever want. Baby heads, big chunky boulders in spots, and is moderately steep. It gets rugged once you pass the OTT and Sterling Justice trailheads on the way up.
I'll second Sap Tree if it's not snowy. That rock garden is legit double black diamond stuff; I crashed and bashed my rear derailleur and hanger tab on that trail.
Sent from my Pixel 2 using Tapatalk