The prettiest place I have seen in Clark County is the area surrounding the nearby unincorporated community of Hockinson.
[size=8pt]Imagine that you are on a long, straight two-lane road out in the country, there's virtually no traffic, and there's nothing around you except the bucolic splendour of Cascadian foothills, farmland and the occasional four-storey-high-rise $150 000 000 000 mansion.
But it doesn't hold a candle to I-90 heading through MT and ND, or even I-84 to/from Pendleton.
Hockinson itself, depending on where you are in town, is a dump! (In fairness, the very same thing can be said about many areas of Vancouver, especially the further north and west you go!) The main drag's nice, tho, and has a distinctive "small-town" ambience that you don't find down here.