Bike lanes, indicated by a yellow line and a yellow bicycle symbol on the pavement, are ubiquitous downtown. Yellow signs indicate routes elsewhere in the canton. Genèv'Roule rents out bicycles from May to October in all of their locations; Les Grottes stays open year-round. Pay a deposit of 50 SF and return the bike by 9:30 PM between May and October, and you "rent" the bike for free.
Genèv'Roule (17 pl. Montbrillant, Les Grottes. 022/7401343. www.geneveroule.ch.)