Just leave your car standing
The local buses of the Montafonerbahn operate throughout Montafon. The main lines run hourly from Schruns station.
From Schruns station you reach Partenen with bus line 85. The stop is: "Bergbahnen". From the bus stop, you can reach the valley station of the Vermuntbahn in five minutes on foot. With the Vermuntbahn and the tunnel bus you continue and reach Silvretta-Bielerhöhe with the Silvretta lake.
For the way back
You return from Partenen to Schruns station by bus line 85.
mbs bus timetables
Arrival by train
From Bludenz station, the Montafonerbahn runs hourly (sometimes every half hour). There are also direct connections from Lindau (D) and from Bregenz.
mbs train timetable