IMHO, Geneva and her lake are only fantastic in summer time. Get a Gemeinde ticket for CHF30 and travel down there. Then transfer to boat to go to the French side and have delicious icecreams paying in EU, later back in the boat and all the way to Lausanne. Next trip plan Laussane-Montreaux by ferry same way. The crew is nice, basking in the sun with squiet noise of propeller and nice breeze while sipping reasonably priced drinks. Voila c'est la vie!