Personally, I like the town of Lewes. Arty farty yes, but also full of history, centuries old traditions and twittens that walk you back in time. Talking of time, if you have some free it's worth seeking out the flea market in Market Street for that antiquity bargain or a trip down memory lane – 'we had one of those!'
Overlooking this county town of East Sussex is the picturesque ruin of Bray Castle, now Lewes Castle, preserved by the Sussex Archaeological Society since the 1850s. The grounds are well kept and compliment the two mottes, unusual for a motte and bailey castle.
But for me, it's the two keeps that are the jewel in this flint and limestone crown. Accessible to the top the views over Lewes and the Downs are well worth the entry fee alone - simply glorious, especially with a dusting of snow.
Visit the Sussex Archaeological Society website for information on the castle, museum (great exhibits) and Lewes.