The Eiger Trail runs along the base of the Eiger's north face between Eigergletscher station (2,320 m) and Alpiglen (1,616 m), a descent of about 700 metres over roughly 6 kilometres. You take the Jungfrau railway up to Eigergletscher and walk back down — the trail takes two to three hours and requires no technical skill, just decent footwear and a head for exposure.
The path is one of the most dramatic walks in the Alps: the north face towers above you for most of the route, and the views across the valley to the Wetterhorn and Schreckhorn are outstanding. In places the trail passes within metres of the base of the wall. The descent through meadows to Alpiglen, where you catch the train back to Grindelwald, passes through some of the finest alpine flower country in the Bernese Oberland. Go in July or August for the wildflowers; avoid it after heavy snowfall.