Nice optional route in the Boise Foothills that connects Military Reserve to 8th street and upper Hulls Gulch. You're only on the very lower end of Three Bears #26 for about 1 mile where it is an old road, then you turn off on Trail #5, which is a steep ridgeline old two-track. Fat Tire is a nice bench cut singletrack, and Trail #4 is steep as well and shared with OHVs but a good downhill run.
Take 8th Street in north Boise past the Lower Hulls Gulch parking area (or park here and ride up Lower Hulls to Trail #4.) to the motorcycle parking lot on 8th street where Trail #4 starts. Or, park at the end of Mountain Cove Road - at the south side of Military Reserve - to start at the bottom of Three Bears (or Ride Military Reserve trails and ride to Three Bears).
http://www.singletracks.com/item.php?c=1&i=3687