The Princeton Art Museum recently opened on Halloween last year and is a beautiful part of campus. Obviously, in the museum you can peruse the many famous artworks held inside, but the museum is also home to many cool spaces to sit, chat, or work. With a restaurant upstairs and third-spaces scattered throughout, the museum is a great stop if you want to switch things up.
If you want to keep moving but want a very similar but more lowkey spot, you could try some of the spaces in Frist Health Center.
If you're still looking for a calm place to chill for a little, but you've been wanting to get some fresh air, you could instead head down campus to Forbes lawn and enjoy the view.
Now if you're looking for something completely different, you could catch the bus on Goheen Walk and ride it all the way down to Meadows.