Being a busy business city, Geneva has markedly cheaper hotel rates at weekends.
April and May see boats going back in the water and the lake's quays coming alive with city dwellers walking, rollerblading and hanging out in waterfront terrace bars.
July and August are the months to swim in the lake, dive off jetties, discover the city’s alfresco cafe society and picnic in its many parks.
Winter, with its December festivals, toasty lakeside sauna bars and fondue cuisine (not to mention nearby skiing) is a real charmer.
Read more: http://www.lonelyplanet.com/switzerland/geneva/essential-information#ixzz4CrRtXHRq