A beautiful coastal walk on Mull (the 'fossil tree' area), on a freezing cold day in early spring, snow on the higher ground but it was a rare sunny day with stunning blue skies, and the colour of the sea and the quality of the light were just incredible. I'd love to do that again in similar conditions.
Or Kinder Scout the day after New Year's, via a very icy Grindsbrook Clough, one of those bright and sparkly winter days, and so cold that the bog was all frozen hard and a delight to walk over.
Maybe time to think about planning some winter walks!
I'd like to have another go at Gran Paradiso, attempted it nearly 20 years ago but had to turn back before the final climb to the summit as I was feeling so ill (possibly altitude-related, though everyone else in the group was fine; I remember spending a very miserable day and night curled up in my bunk, shivering under a scratchy blanket with the worst headache ever, clutching a plastic bag in case I didn't make it out of the bunk in time to throw up again... hmm, maybe not an experience I want to repeat after all...)