This might sound a bit unusual, but I think my happy place would be in a big, open garden with no neighbours around to see in, and a swing hanging from a tree. I used to love my swing as a child and, always being a dreamer, I used to listen to my music coming from my open upstairs window as I would swing, and I'd look up at the sky and the clouds and the birds. I've always had a thing about the sky and birds. So my happy place would be one of those seats or car tires hanging from a large tree, in a private garden with some of my favourite music, and the sky.
Socially anxious, highly avoidant, sufferer of health anxiety, generally nervous nelly, depressed because of it, and a maladaptive daydreamer to escape!