To get to Sugarloaf Road, you would need to take Canyon Road (119), as if you were driving up to Nederland. After you pass through the small tunnel, it is the first right turn after Magnolia Road, which is a left turn.

If you follow Sugarloaf Road all the way up, it brings you to the Peak To Peak Highway (72) between Nederland and Ward. Then you just head to Ward, and grab Left Hand Canyon down to 36 (making sure you turn right at the stop sign halfway down LHC)., and then you turn right on 36, and that brings you back to Boulder.

Way too many fun loops you can do above Boulder.

BC.