Now I'll be the first person to say that Engineering is probably the smartest degree choice you can make, but if you are just doing it for the hell of it, I think it might be a bit of a crushing grind. Lots of work, lots of time, and lots of nerdiness.
As for Job prospects, engineering is the bestest for all that employment stuff (forget all these losers who go on about 'prestige' getting you a job, it's the degree subject first) and Civil is one of, if not the, best for employment out of all the disciplines.
It is a very good choice of degree, but be careful, it might not be fun.