My favourite thing to do in Lausanne was the wonderful lakeside walk from Ouchy to Vevey.
It is about 12 miles - but there are lots of train stations en route so that you can get back to Lausanne easily and make it shorter .
You pass through wonderful quaint Lutry , Cully and vineyards where there are many wineries open for sampling , especially in the 3rd week of June .
There are lots of good restaurants along the way , beautiful lakeside homes to ogle , and the magnificient scenery and wildlife . Bring your swimsuit too - there are many opportunities for a dip - I was soo annoyed that I had left mine at a hotel in Villars !! ( they were great - it was posted back to Britain very quickly - and after our experiences at Heathrow , I think I will travel by post too !!!)