This amazing park isn't the most well known in London, but in my opinion, it's a hidden treasure. It's big enough for a good 30-minute stroll, it has a beautiful lake with swans, and a historical rose garden in the middle. There's a Victorian bandstand, which is adorned with fairy lights to make your twilight walks magical. And, in the summer, there are boats on the lake!
Gomm Rd, London SE16 2TX, UK