I think the Tuileries, right next to the Louvre, is the grandest garden in Paris. It feels so royal and majestic, with an amazing view of the massive Louvre. Though it used to be a royal garden centuries ago, the park has been open to the public since 1667. You can picture Parisians of yesteryear promenading around, and the heartbeat of modern Parisians (and visitors of course!) enjoying themselves today. There are always seats open, no matter how crowded the park is. It's just the perfect place to nibble on a baguette and cheese. Of all the gardens I lounged in in Paris, I miss the Tuileries the most.