Just leave your car standing
The regional buses of the Montafonerbahn operate throughout Montafon. The main lines run hourly from Schruns train station.
From the Schruns train station, you can reach Schruns-Tschagguns by bus line 2a or 2b. The stop is: "Sportplatz/Aktivpark". In five minutes on foot, you reach Aktivpark Montafon via the underpass and Ill bridge.
For the return trip
Using bus line 2a or 2b, you go back from Zelfen in Tschagguns to Schruns train station. From there, you can transfer to the Montafonerbahn.
mbs bus timetables
Arrival by train
The Montafonerbahn runs from Bludenz train station hourly (partly every half hour). There are also direct connections from Lindau (Germany) and Bregenz.
mbs train timetable