Re: London, I've not lived there for 25 years, but I'd probably spend the time in the museums -- the Natural History museum, the Science Museum, the British Museum, the Wellcome Institute, which, oh, its current exhibition is "Rooted Beings, which invites you to embark on a meditative reflection on the world of plants and fungi. The exhibition considers what we might learn from plant behaviour, and the impacts of colonial expeditions on the exploitation of natural resources and indigenous knowledges." That sounds like fun! It's the sort of thing I'd drag my wife round, and she'd hate. Or I'd go to Kew gardens, or Wisley. But that's me...