Switzerland runs on the yellow diamond — the Swiss Hiking Federation's waymark, painted on rocks, walls and fingerposts from the Jura to the Ticino. The trail network is exceptionally well maintained, the mountain infrastructure is unmatched (postbuses, cog railways, cable cars run to timetable in the middle of nowhere), and the walking is as spectacular as anywhere in the Alps.
The Bernese Oberland is the postcard region — the Eiger, the Mönch, the Jungfrau and the balcony trails between Adelboden and Grindelwald look out onto all of them. Further west, the Valais has drier weather, quieter trails, and the wild limestone towers of the Dents du Midi rising straight out of the Rhône valley.
The huts and mountain inns are excellent — timber-lined dining rooms, thick soups, rösti, a jug of Fendant on the table. Trails walk best from late June to mid-September, when the passes are clear of snow and the lifts are running.