Depends how long you want to take and what you're into really. If you head to Dumfries on the A75 and take the A710 coast road through New Abbey; Sweetheart Abbey and the corn mill are worth visiting couple of nice pubs too. on to Sandy Hills; lovely beach but tides can be treacherous if you go too far out or you could go on a bit further and stop off at Kipford which is absolutely beautiful and has at least 4 pubs to choose from then round to Dalbeattie (the granite town) pick up the A711 and head through Auchencairn nice tight twisty road up through the village with a very good pub on the righ hand side sod it just go A75 to Dumfries, A710 to Dalbeattie (not A711 yet), A711to Kirkcudbright A755 to connect with A75 again, at Dunragit turn off on teh B7084 for Drummore at Drummore follow the signs for the Mull of Galloway, this is the most southerly point in Scotland, has cracking views and the next stop to the west is the USA there is a decent resteraunt here as well. from there there are a couple of ways to go depending on how much time you have etc