Dumfries and Galloway: See
Robert Burns sites are mostly in or near Dumfries, but see Annan for the curious pool where he bathed in forlorn hope of a cure.
Old churches and abbeys: best is Sweetheart south of Dumfries. Scotland's first church was at Whithorn, but the present ruin is 12th century.
Castles are mostly well-ruined, but Caerlaverock is impressive for its islet site. Dumlanrig is a grand palace built for bling not defence.
Gardens: the best are Threave near Castle Douglas and Port Logan towards Drummore. Scotland's Gardens is a scheme that opens up private gardens once a year in summer, with all proceeds going to charity. There are some 40 participating gardens in this region, dates staggered so there's one open most weekends.