Staying Busy?

So right before the school year started back in late August, I had an entire week off to do whatever I wanted. It was the last week of summer, and the pool where I work canceled lessons for the week, so I litterally had no responsibilities and was looking forward to a week of complete relaxation. Sounds like a good deal right? Not quite. I don't know if you guys have ever felt this way before, but as soon as my schedule freed up, not only did I become unmotivated and lazy, but I also started feeling depressed. DEPRESSED! Who gets depressed at having all the time in the world to do what they please? But that's exactly what happened; by the end of the week I couldn't wait for it to end. It wasn't quit the vacation I had imagined, but why?
A few weeks later I was driving to my second job after just clocking out of my first one. This was by far going to be the busiest week I had seen in a long time: I was working 2 jobs in the morning and evening, doing schoolwork in between, and trying to fit in my other commitments, which included spending time with friends of mine who would soon be moving to the West Coast. So during the drive in between jobs, I could've grumbled about how busy I had become and how I didn't have any free time to do anything. But instead I found myself doing exactly the opposite. I was happy for the first time in over a month! Somehow I had broken the curse, and I realized: to stay happy, I have to stay busy. Not busy to the extent that it becomes unhealthy and I begin to neglect my family or friends and even stop taking care of myself. But busy enough to feel accomplished and challenged and satisfied, things that can be vital to our well-being.
The saying that comes to mind is "Idle hands are the devil's tools." If we're not working toward anything, aren't we missing out? Just something to think about :)