This impressive tower was built in the 15th century, originally home of the Pringle family. It was a favourite of Sir Walter Scott (ok, now you're actually reading this tip), who stayed at his grandparents' farm in Sandyknowe in 1773 as he was recovering from poliomyelitis.
It is now managed by Historic Scotland. There are exhibitions here related to Scott, ballad and folklore. From the battlements, you will get terrific views of the area.