with respect to your initial request reqarding some main spots in Switzerland I would like to recommend hereafter mentioned destinations and/or cities. Not sure if you're interested in more landscape or the typical city view with some museums and cultur, but however I will cover both. In addition I'm not sure about your original home country - Switzerland is small and you can reach normally each destination by train within 2-4 hours / car is not much faster.
Traveling in Switzerland is really easy and for sure in general safe. Take care about the typical security and safety hints in foreign countries, but no worries. The public transport is perfect to catch each destination by train, bus or some other local transporation like ships.
- Geneva // walk around in the city itself and enjoy the waterfront with the Jet d'Eau as large water fountain - maybe a short stop in the cathedral saint pierre or the UN part of the city
- Berne // catch up depending on the weather conditions the ship across the lake lucerne, take a stop in Lucerne itself to watch the chapell bridge and afterward you can climb up to Mount Rigi or Mount Pilatus for a breathtaking view from the mountains
- Zürich // from my point of view a typical business city - explore lake zuerich and the city itself for some old historical buildings and museums
As add-on if you have one or two days time left - travel to Jungfraujoch as top of europe (but take care - typically tourist spot but still great) or travel to Zermatt and drive to the Gornergrat with a breathtaking view to the Matterhorn.
I'm living there and you can check my flickr account for some capture from the mentioned areas.
Flickr in generalhttp://www.flickr.com/photos/15140450@N04/
Matterhorn / Gornergrathttp://www.flickr.com/photos/goerner/sets/72157615253565750/
Enjoy your stay