Your search "lawn" resulted in 3 Articles
Weather is nice and you do not want to spend the lovely days inside or in the middle of the rushing crowd searching for some sightseeing spots. Then I have a lovely solution fo you: Picnic in Prague.
The Eiffel Tower might be Paris' most popular attraction, but I've always preferred the park below.
Lake of Martignano, you will hate it or love it for the rest of your life, and you realize it immediately.