The Greystone Mansion & Gardens is beautiful, a nice little escape from the city. Drive up the hill and don't worry, there's plenty of parking! We visited in mid-October, the mansion wasn't open, BUT the gardens themselves are plenty to explore. You can spend about an hour here and take lots of nice photos. Definitely a great spot for some photo sessions. There are public restrooms, they're sort of hidden away in the mansion lol but still accessible. There is a nice balcony area where you can get a fantastic view of the city below.
Only taking off one star because I wish there were some benches set up and I saw maybe like 2 trash cans. Beautiful place to come to relax and have a picnic if you want, but I recommend holding on to/collecting your trash until you find a 🗑️ can. Not a big deal but just a little inconvenient.