<human>: I was let go from my last full-time job in October, and while I've acquired part-time work since I've been looking for something to supplement it.  Last week I had some job interviews.  The first of them was for a contract-to-hire position, through a recruiting agency, working at a well-established but not well-liked company nearby, doing work I'm not sure if I'd actually like.  Unexpectedly, the job interview went well and they offered me the job later that day, to start around two weeks later.  At the time I heard about this, I had other interviews coming up with places I had already been in touch with for longer - one in particular for a direct hire position at a smaller company - and was more interested in them, so I told the recruiter I would give him a final answer at the end of the week.

So the end of the week comes, and I had those further interviews, but was told I wouldn't get a definite answer from either of them until early next week.  Not wanting to lose the first offer completely and thinking it was still better than not working at all, I told the recruiter I would accept the offer, and signed off on the paperwork.  However, one of the following interviews gave me an offer as well, one that's offering a more interesting job, better pay, and what looks like a better work environment.  I think I'd be much happier with the second job, and plan to view their offer letter in detail when it was prepared tomorrow morning.

Now the question is, should I be concerned about burning bridges with the first job, the one that I'm prepared to withdraw from the job before even starting?  Is there a way I can do this without any hard feelings and without this potentially biting me back later?

Can you condense the text into three sentences or less?
<bot>: version: Accepted a job, then got offered a better one before my first day.  Looking for a way to turn down the first job after already committing to it while minimizing consequences.