In reply to Nicola:
Cairngorm uplift is in a right mess. It’s possible to get to Nevis Range and back in a day, so consider that if really good on the West for a couple of days, the outlook is much better than Cairngorm as well. Though it’s a drive so you probably wouldn’t want to do every day.
Other things to do; MTB the trails and tracks around Aviemore are very good, bike hire is easy if you don’t want to transport your own. Good for thrash in poor weather.
Walks around Loch Morlich, Garten or Loch Eliean can be stunning.
Moray coast villages, Portsoy, Cullen, Gardenstown, Pennan, ect are scenic and if in Cornwall would be rammed with people, they will be very quiet, so much so you’ll predominantly have to make your own entertainment. Again a bit if a drive.
Post edited at 13:13