You do not need to buy Borghese Gallery tickets to enter the Borghese Gardens, as the gardens are a free park amenity that you are able to enter and leave at your leisure. The park is a popular spot with local Romans for picnics, sport, and walking their pets. With around 80 hectares of lawns, walking paths, and even a small lake you can take a paddle boat out on, it's the perfect place to unwind before or after some art appreciation in the Borghese Gallery.