Spending one day in St Moritz or bernina route.

I am thinking of doing bernina express from Tirano on way to Paris, first week of august .
I will be leaving early from Tirano and would be in St Mortiz by noon at the most.
So I will have that rest of the day and some of the early next day to spend there.
I am looking for suggestions on, where to spend that day or so.
What is the most scenic place around ?
I would prefer a village or a small town with some gorgeous views. Looks St. Moritz is too commercialized
Would love to ride a cable car , if there are in that area.
I am also open to options outside of the bernina route, but not far off as, I am short on time.
If there are better options enroute to Basel from st.mortiz , I am open to that too as that would on my way to Paris.