From the Grimsel Pass, a single-lane road leads high above the Grimsel Reservoir to Lake Oberaar, which is also a reservoir. The view of the Alps is, in my opinion, one of the most beautiful in all of Switzerland.
Please note that the road is only accessible to motorized traffic in one direction. A traffic light system at the Grimsel Pass and Lake Oberaar regulates the direction of travel. However, this is less relevant for cyclists; the road is wide enough everywhere to allow safe passage.