Champagne Garden at Hotel Chinzanso Tokyo

Trust the Hotel Chinzano to supply a classier alternative to Tokyo's beer garden booze-ups. The elegant Mejiro hideaway is putting its new rooftop Serenity Garden to good use for this summer-only promotion, where ¥5,000 gets you two hours of free-flowing Laurent-Perrier champagne – the same tipple served at Kate Middleton and Prince William's wedding in 2011. The price also includes wine, beer and a selection of nibbles, though note that you'll need to reserve by 6pm the day before in order to take advantage of the offer.