Suffolk

Well, I don't know Southwold v well to be honest. There isn't that much at Dunwich (it's all in the sea!), although crucially there is a pub. I was there over Christmas and New Year, when I went a couple of years ago, (my mum was brought up in Woodbridge nearby) and public transport was extremely haphazard. I ended up walking to Dunwich and back from Aldeburgh, most of the 'back' in the dark, including an extremely unnerving section across the heath and down past Sizewell B.

After that whenever I needed to go anywhere I couldn't walk I ended up just getting minicabs.

Southwold has the Adnam's brewery of course, and there's the foot ferry to Walberswick, which I think is only open in the summer (remember going across it when I was 12 or so), and you'll see the lighthouse.

Actually doing stuff apart from drinking and eating and walking (which I'm usually quite satisfied with) I'm not so sure about. There is plenty of excellent walking though. If it's clear, do go down to the coast at night, the stars were magnificent, and with the winter roar of the ocean the whole thing was quite overwhelming (lol pissed).