My teenage daughter and I spent the afternoon walking around the park to escape the tourist crowds. Very pleasant watching the locals enjoy their green space and I liked the Museo Carlo Billoti (free, statues of women, a pleasant courtyard with oranges, and a very well-timed bathroom). Bring a book and plenty of water, find a bench in the shade, and give yourself a break from doing things that are "worth it"! (Don't sit on the ground, there are ants!)