England is small but you can easily spend 3 days in one small part of it... There's so much history and things to do/see! What exactly are her main interests? Nature, museums, architecture, Christmas markets? That'll help give advice for what to see. She'll be constantly travelling if only giving herself 3 days for the entire country!
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Yeah, that's what I've been trying to tell her. Landing in Manchester, than travel to Wales is a day gone - and she'll be tired, as she's coming in from the US West Coast, so that first day is going to be pretty much lost. She loves trains, so she's going to go from Wales to London so she can take the Caledonian Sleeper to Scotland. Apparently that's on her bucket list.
She's NOT into booze/boozey crowds, so she'll be spending a quiet Hogmany in her hotel room somewhere up here. If she's up here on Christmas proper we're going to invite her to stay with us, as there will be nothing for her to do on that day and no way to get to it (unless she's rented a car). But other than that, she wants to see "scenery", ride trains, etc. So the traveling will be part of the fun for her.
I am going to suggest that she go ahead and go over to London when she's through with Wales, and then see the usual tourist sights there. I have warned her about the insanity that is Oxford Street. I was also going to advise her to take several day trips out - when we've been in London we took day trips to Canterbury, and to Stonhenge/Glasgonbury, etc. Or, since she's coming in from the West she might just go to Glastonbury or Wells and use it as a base for a day or two, then come into London. I'm not sure how well she'll deal with London and all the people/traffic/noise therein.
I was also going to suggest to her that instead of the Sleeper she just take a train north and spend at least a day and a night in York. I believe there's a nice Christmas market there, and I think she can get out to see Hadrian's wall via tour from there. She'll be eventually ending up in Edinburgh. Which has another nice Christmas market. She wants to go to the Highlands, but I'm not sure the weather will allow much of that. She's going to have to play it by ear. If she does take the Sleeper, she can go all the way up to Ft. William, but I can't imagine there'll be much for her to actually do there in late December?
I have also warned her that "daylight" is 9:00am - 4:00pm and that the sidewalks (except for bars/restaurants/theatres) pretty much roll up around 6pm. She's never been to the UK, so I would like for her to have a nice time - she's braver than I am, making a three-week trip like that on her own!