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" if you do not mind to walk an extra 5-10 min
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From the parking follow the path along the river, until you reach the bridge. Cross it and follow the big gravel road, to the left. Refer to the gpx track on the map