I got such good advice for a stopover in France that I wonder if anyone can help for a day trip to one or two of the above in August? We will be based in Lucerne and have a spare day and thought a day trip to Lauterbrunnen, Grindelwald or Interlaken might be worthwhile.
Lauterbrunnen village and the waterfalls looks nice but is there anything else you'd recommend? We'll have already been up at least one, if not two, mountains so I don't want to spend another £200+ on cable cars. The DCs may also be hiked out by then!