You've got a ticket to riches, and you're questioning it???
The real question is what better alternatives do you have?
I doubt there are better, if your purpose is making money and specifically to get rich!
A Goldman Sachs internship and the prospect of a job offer, I've known people who would shed blood to be in your position.
Look for a rental in Brooklyn, Park Slope, Cobble Hill and the like. Great urban family friendly upscale neighborhoods; or if you are more suburban oriented look into Essex County in New Jersey.
Take the job, work really hard and smart! In two or three years, you can buy your dream house/apartment with that bonus money!!
Watch out for that "Gifthorse" it might snap your head off if you look too deeply!