La Promenade Plantee
The Parisian answer to NYC’s High Line, this garden was built atop an old rail line. The linear boardwalk stretches 2.9 miles elevated above the streets of the 12th arrondissement.
The flowers were blooming beautifully during our spring visit, I especially loved seeing them contrasting with the city below.
More than just a garden, at this height you have a prime spot to oogle and the areas eccentric architecture.
This was definitely one of the quietest places we went to in all of Paris, a bit off beat, local, and really cool.
If you’re looking for a running route, this is a great scenic spot to do so.
Jardin des Plantes
The main botanical garden in France, you may enjoy colorful flowerbeds
and a rose garden,
also so much more! There are many lovely sculptures to ponder around the grounds,
and interesting structures as well. Climb to the top of the labyrinth to find one of the oldest steel constructions in the world.
You can visit the Museum of Natural History here, or take a trip to the zoo! 
Even if you don’t have time to see the entire zoo, you can spot a few of the animals just from walking by.
Wildlife sightings are common in the garden as well. I saw a number of beautiful birds and found a nice fat frog!
You can certainly spend a few hours enjoying everything this garden and its adjacent museums have to offer.
Jardin du Luxembourg
The Luxembourg Palace was built in the early 1600s and today the grounds are a beautiful place to stroll about. Consider renting a remote model sailboat to race around the fountain.
Find the elegant Medici Fountain, built in 1620 by a Florentine sculptor.
Speaking of sculptures, there are over 100 of them in the park ranging in subjects from mythological characters such as Narcissus and Hercules, to historical figures Beethoven and Queen Mary of Scots, and animals.
Spy a great view of the Pantheon in the top right photograph. Have a picnic on the meticulous lawn of the tree-lined promenade.
If your schedule aligns, consider staying for a show at the Luxembourg Puppet Theatre!