Ann Cleeves new series featuring her Detective Inspector Matthew Venn set in North Devon, around Barnstaple are very descriptive of the area, although I don't think they're as good as Vera (Northumberland) or Jimmy Perez (Shetland). All her books give good descriptions of the various landscapes.
I know what you mean about enjoying the setting, Ellie Griffiths' Ruth Galloway books really gave us the impetus to visit North Norfolk, I love the way she evokes not only the salt marshes but her home there, almost as good as the plot imo.
There's always Roy Grace's Brighton of course and his home, in the book, Henfield, mid Sussex often gets a mention, as well as the Sussex coastline adjacent to Brighton. Crimes can be a bit on the grisly side at times.