No special access issues
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Interlaken west is easily reached by train. Walking from there adds about 30 min of approach time. Alternatively you can take a bus to the "Unterseen, St. Niklausen" bus stop
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Check the map for the options to park. Best to go for the free parking at the "Vitaparcours"
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From the parking follow the path along the river, until you reach the bridge. Cross it and follow the un-marked path on the right hand side into the forest. Refer to the gpx track on the map