I think it just shows you work plenty hard, WHICH IS WHY you SHOULDN'T feel guilty! You definitely sound like you deserved the weekend off and you seem to enjoy your job, which is probably the main reason you feel guilty. That's the same reason I always felt guilty.

I know the feeling, this year at work our department was WAY under-staffed all summer. I was under-aged over the summer (17) and I couldn't legally work double shifts due to child labor laws. My friend, and the clock-in supervisor, Tiago would make me feel bad every morning when I was working day shift (10-5:30) telling me about how he needed good characters for the parade and it always made me feel like I needed to stay. So I would stay for my shift, clock-out, wait like 4/5 extra hours at work and go back to sign-in at 7:30. It was kind of ridiculous now that I think of it and I highly doubt I would ever do that again. Well - now I can work double shifts so it's not a problem. But I LOVED doing the Parade, it was so much fun.