Consider getting a "Paris Visite" transit card if you anticipate spending a lot of time in the Paris Metro.
Free entry is offered at the renowned Louver Museum on the first Sunday of every month from October through March.
There are numerous stunning vistas and quaint landmarks, but you'll have to travel a fair distance to see them.
There are several high-caliber, yet reasonably priced bars and restaurants in Butte des Cailles, which is a haven for artists and a welcoming haven for street art.
Many tour companies provide free walking tours of Paris's top attractions.
The Velib bike-share scheme in Paris was one of the first in the world when it initially launched in 2007.