"They usually go to the west coast in summer."
Translation:De brukar åka till Västkusten på sommaren.
Proper names of places are capitalized in Swedish. This includes compunds, both those composed of two nouns and an adjective an a noun. E.g. Västkusten, Sydfrankrike, Östafrika, Sommarsverige. Compare these to västra kusten, södra Frankrike, östra Afrika, somriga Sverige. Sometimes both a compound and the adjective + noun are considered proper names, and both words are thus capitalized, as is the case of Mellanöstern and Mellersta Östern. However, proper nouns for residents of a place are not capitalized (stockholmsbo, göteborgare).