There are plenty of parks in Japan where people hang out, lay in the grass, play instruments, practice their lines, drink socially, enjoy their lunch, walk thei

There are plenty of parks in Japan where people hang out, lay in the grass, play instruments, practice their lines, drink socially, enjoy their lunch, walk their dogs, go for runs, etc. I suspect what is a park and what isn't might not be easy to tell as a tourist. If you are trying to lounge in something that isn't technically a park, there's a good chance it won't be received well. That being said, in Tokyo, most of the central public parks are packed during the weekends. Tokyo could definitely use a lot more, imho.