recommendations on must see things in Switzerland.

We will have 5 days in Switzerland and 10 days in Italy.

2 adults. 3 teens.

I served my mission in Italy so I have those 10 days planned out pretty well.

It's Switzerland I'm not sure what to do/see. We are mostly interested in spending time in the mountains but a cheese or chocolate factory visit would be fun too. Is it worth spending a day in Zermatt?

I'm looking at early to mid June 2025 if that makes any difference.

TIA.