@AnarchoCatgirlism@cyberpunk.gay la belle ronde is a really nice hidden place to eat crepes and galettes
Like the others here i highly recommend orsay.
Apart from that, if you want to chill in nice places you can go a bit outside of paris to versaille's gardens, parc de sceaux (which has a lot less tourists but is still a great place) or l'hay les roses's rose garden (20 minutes by feet from the subway but the place is really pretty and it's free right now because it's a bit outside the blooming season)
Enjoy!