it is a gorgeous cycling haven, and I think most of them there learn to ride a two wheeled bike by the time they are 3 so one handed riding is pretty much a given to them, I've seen them carry groceries, cellphones, cup of coffee and umbrella when it's raining. Pretty much the main form of transportation in the city. When we arrived at the airport and needed to get to the main city by the shuttle, cars have alot of problems moving around with one way streets and no turning here. When we rented a pair of bikes it was soo fast getting across the city center from one tourist spot to the next.

Oh yeah make sure you practice and are comfortable riding in crowds before heading there, during rush hour before and after work it really is RUSH HOUR! but with bikes! No sudden turns or sudden braking, I find among themselves they move very smoothly like a peloton and they usually AVOID tourist rental bikes like the plague if they see one on the road (they're labeled as such for the safety of others) .

Paris isn't such a friendly bike area but they do have a amazing looking trail along the seine river, we just travelled by subway there cause of the cars there and no real dedicated cycling lanes for the wife.