You only have 7 days to discover Switzerland? Let me tell you what you can do in so little time and particularly what you should not miss during your visit.
First of all, I would recommend that you buy a pass to use the Swiss public transports. There are different formulas for tourists, SwissPass, 3 days, 4 days, 8 days or 15 days. The SwissPass lets you travel freely on the Swiss public transports. And it helps you save a lot a money!