I live in East Lothian, which has a border with Edinburgh on it's east side. There is also a coast line of about 45 miles with many fine beaches. To the south, the county is bordered by the Lammermuir hills. East Lothian is mainly an agricultural county with the big town of Mussleburgh on the west side. There are some old mining towns of Tranent and Ormiston and towns with a fishing and trading history at Prestonpans, Port Seton and Dunbar. In the middle of the county is the market town of Haddington (where I live.) The rich people live in the East of East Lothian in the Biarritz of Scotland at North Berwick.
East Lothian is not too far from the border with England, and there is a history of invasion and battles between the Scots and the English... so there are a lot of castles in the county. One of the most dramatic is Tantallon Castle on the coast road between North Berwick and Dunbar. Castles and the sea make a great subject for painting. Here is a painting of Tantallon, I did at the end of last year.