What should I do about the job offer?

I just found out I was hired by a university to be an academic librarian. But I really want to work somewhere else I interviewed for this week but they don't stop doing interviews until the end of the week.

Should I just take the academic librarian job that I know will pay slightly more money but be sort of miserable or go with the job I really want but have no idea if they are even going to hire me until possibly next week.

I don't want to keep the academic library waiting too long on the offer especially when they wanted me to start Friday. I want to make a decision no later than Tuesday or Wednesday of next week.
What should I do about the job offer?
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