Jesse Johnston: Given the sheer size of the park, you'd never know how many people were there, but it's very obviously a popular spot. Alcohol and picnics are encouraged and there's a dedicated bike path for cyclists
Bubble: Onsen in a suburban quiet Tokyo area. It's more original and cheap. You get a towel for some extra bucks. Has a restaurant, a zen garden, sauna, jacuzzi and a relaxing spring in the open.
Ruby Anaya: Just be prepared to tell them one or two flavors/spirits you like and prepare to be amazed. The gin and ginger combo I had was phenomenal. They also serve little snacks while you drink.
Magdalena Mrázková: You pay 200yen at the entrance but it's more than worth it. Gardens are so beautiful, and the grass is more than inviting to sit on;)