One of the best things about London is discovering hidden gems in places you thought you knew. I've walked across Regent's Park dozens of times, but had no idea it contained a secret waterfall and hidden Japanese island garden, which most people seem to walk right past, until reading this blog post.
Both the waterfall and the Japanese garden are located in the Queen Mary's Gardens (in Regent's Park inner circle), most famous for its 12,000 roses. Simply enter enter via the Jubilee Gate and take the first path right and you should be able to find both fairly easily.
While the rest of Regent's Park was quite busy this weekend, this small section of it was remarkably quiet.