If there is one thing (apart from fashion) that the Europeans do well it is formal gardens.
I spent an afternoon in the Jardins de Luxembourg just strolling around. It was a beautiful autumn day and lots of Parisians were out taking advantage of it.
The great thing about parks and gardens in Europe generally is that lots of people use them. Children come to play, couples come to picnic, people come to sit on the benches and read or just sit and watch the world go by.