It's a funny old thing, I've been driving past the devils porridge sign for years, and travelling that road for the past 40yrs since meeting my good lady, and only visited the museum earlier this year.
Another interesting place to visit, not quite Dumfries and Galloway, but not far away , is Dumfries House, Cumnock, East Ayrshire.
Free to visit apart from house tours, which to be fair are very good.
Now owned by a trust headed by King Charles, it has been restored to how it was hundreds of years ago, including g the grounds and gardens, they also run apprentaship courses from there covering all the old trades, timber work, decorative plasterwork etc.