Paris may be busy in the summer period, but it is definitely a great place to be to capture the floral and greenery of the major parks here. From the large Jardin du Luxembourg right through to the smaller pockets of greenery, these parks offer a respite from the crowds.
A thing I like to do is to grab some fruit, a bottle of water, and a salad from Monoprix or from any of the groceries, sit in the park and eat lunch. It’s a cheaper way to refuel compared to going to sitting in a cafe (which is also nice!).
There was one such time near the Picasso Museum where I overheard a group of three women talking about perfume scents (I think their job involved coming up with ideas to talk about perfumes), not to mention watching the families and tourists alike mill around.
I highly recommend milling around Jardin de l’Ecole Botanique and so on and taking a look at the descriptions (if you can read the French).