Can't remember the exact quote but it went something like this:
"No one at the end of their life wishes they had spent more time working/at the office"
While you should always work hard and do you best at your job, it pays off, you should realize there are way more important things in life like family and friends. If I could spend the rest of my life alternating between spending time with my family and porch drinking with my friends, I would be so content with my life. But you gotta work, so work in the good times around work, and do something if not love, at least tolerate and you can see yourself doing for 30+ years.
Also, if you don't love your job but can tolerate it, keep working at it, you never know when the job you love will pop up due to your credentials. Also, be kind and work well with the people you work for/with. Case in point, while I wouldn't take the job my client often reminds me that they are hiring and asks me if the town the plant is in would be something that I could see myself at long term. While mostly in light jest good work often leads to offers from those you work for, so to reiterate even if you aren't in love with your job, keep at it, you never know when that work is noticed by a company you work with and they give you an offer you can't refuse. But always be polite about it, remember you still work for someone else.
Also in the vein of keeping at it, when I was at the airport returning from site the last time out (about 2 months ago) there just happened to be some recruiters going to the KC area for Sandia National Labs, and after my project manager and I just were just talking to them about our jobs, and their jobs, and where to go to in KC, etc. one of the guys essentially told us if we were interested we should give him a call to interview for Sandia. While tempting I don't think I could live too far away from my family, friends and the 'cats just yet, especially since my job currently is pretty good, but once again, always keep at it and be friendly, you never know who you're talking to and what they may be able to do for you. Which leads me to my last point and my dad's favorite quote about work:
"It's not what you know, it's who you know"
And it only gets truer at time goes on.