Some travel decisions can only be viewed in hindsight. Lucerne was an awesome city to explore and I had a great time. But am I about to turn a pessimistic spin on a positive experience? You bet I am. I wish I had spent more time there. We had just enough time to buy souvenirs and walk across a bridge before the rain started. And by the time it stopped, we were on to the next destination.
Pro-Tip: Soak it all in for as long as you can. Or until you get soaked.