Not overly technical but definitely a workout!
This is a scenic trail that starts with a good 8 mile leg- burning climb up Fisher Creek Road to really get the heart going (perhaps exploding). Then a singletrack and road decent down Williams Creek Road and finally a quick 1.25 mile jaunt back to the parking area.
How to get there:
From Twin Falls go North on Hwy 75 past Ketchum and over Galena Summit. Continue North to Fisher Creek Road and park. You'll be in the amazing Sawtooth National Recreation Area. From there hop on your bike and head up the road.
This ride is probably best done in the summer but bring water & supplies.