Jul 31, 2016 - 3:16 PM
in reply to weetea
There is a boat from Interlaken West at 3.10 p.m. which arrives in Thun at 5.20 p.m (scheduled to be the paddle boat) or one an hour later at 4.10 p.m. You could then get a train or bus back to Interlaken.
From Interlaken Ost there is a cruise on Lake Brienz at 3.07 p.m. arriving in Brienz at 4.20 p.m. and similar an hour later. Again you could return by train to Interlaken.
There is also Harder Kulm reached by funicular from Interlaken Ost which I believe runs quite late - but you would need to check times at tourist office.
The children might like Heimweh Fluh - there is a model railway exhibition you can visit which is fun (has lots of model trains running including a night scene and a commentary) and also a playground area where they could let off steam!. This is in Interlaken West, not far from railway station.