Re: Must See Places in Geneva?
All the suggestions above are excellent, you have to be in good shape to climb the stairs to the top of the Cathedral tower though, and it's only worth it if there's a really clear sky. Don't forget your camera!
Those I haven't visited yet are:
The guided tour of the UN headquarters, the Cern exhibition and guided tour (I went to their open day in September 2008, which was pretty amazing.
And last but not least the Palais Mascotte. Maybe we could get together a group of glocals and go there, it seems like fun.
If I may add a couple of suggestions, the Red Cross Museum is an amazing place, very beautiful, thought provoking with well laid out, enlightening and moving exhibitions telling the history of their organization and about their amazing contribution in very different areas. I know it doesn't sound very exciting you just have to take my word for it, it's not to be missed. Explanations in English as well as French.
On a summer day get the little boat that crosses the lake from Paquis to Eaux Vives (you can pay for it the same way you would for any bus or tram) Then walk along the lake towards Baby Plage where there are trees with swings made of old tyres and ropes with pullers and levers that's totally bonkers and provided my kids with many hours of fun and gave me sore arms (the little ones need help). Just next to it there is the sandy/grassy beach and lots of sunbathers and swimmers, nice place for a picknic too.
On the way back you can stop at Arlequin, on Rue 31 decembre, a block away from the lake for a gorgeous italian icecream (as delicious as theGelato Mania, promise!).