Simon and Martina go to a hotel where each room has a private onsen. It's a great way to experience the Japanese hot tub culture, and there's no rules (like not allowing people with tattoos in). At the hotel there's a hidden staircase in each room that takes you to a big private hot tub where no one can see you. There's a hair dryer and fridge down there too; the room's completely decked out. Simon got stung on his butt by a bug (so avoid that). The duo think private onsens are a great was to enjoy the 'healing stinky waters.' Would you try them?