Get a Real Job?

I have a real job. 

At least by modern standards.  And it is a good job, especially as compared to many of the alternatives.  I lead tours through the great Mammoth Cave, and most days, it's pretty fun.  I work with a good group of folks, have reasonable supervisors, and at times get paid for doing things like "trail roving" which is a glorified term for hiking and answering questions for the two or three visitors I meet while I'm out there.  Really, as jobs go, it can't be beat.

So why am I disappointed that this is my last day off this week?