On the quai du Mont-Blanc, in front of the Hotel Kempinski, you can find the pier where the "Mouettes" land. The Mouettes are yellow boats, that are part of the public transport of Geneva. You can take them to go to the other shore and it costs close to nothing. Some people even take them to go to work everyday! Taking the mouette instead of the bus or taxi is a very good idea, and the scenery is dreamy.
Quai du Mont-Blanc, 1201 Genève, Switzerland