Choose one of the following based on the forecast:
Clear day โ Jungfraujoch: Leave Zurich 7:30am. Train via Interlaken and Grindelwald to Jungfraujoch (~3h). 2.5 hours at the summit. Return to Zurich by 7โ8pm.
Any day โ Grindelwald + Lauterbrunnen: Leave Zurich 8am. Train to Interlaken, bus/train to Grindelwald (morning). Train to Lauterbrunnen (afternoon). Return to Zurich by 7pm. Suits any weather.
Family day โ Mount Titlis: Leave Zurich 8am. Train via Lucerne to Engelberg (~2h). Cable cars to Titlis glacier. Return by 6โ7pm.