What is this restlessness?

I spent the last 3 hours (and most of last night, really) aimlessly searching the web for activities to do on my upcoming time off from school. Not only that, I also aimlessly browsed job postings for hours on end until my eyes are unable to stay open and I have a pounding headache. What is this?

Have I learned nothing from the meditation retreat I have recently been to? What is this need to plan and try to fill my time, and life? Am I doing this for myself or am I doing it so that I can tell people...oh this summer I did this and that. What did YOU do? Maybe it's a fear of having the summer pass by without any significant learning.

Ideas I'm playing around with for the summer:

1) Ocean kayaking
2) Scuba diving
3) Meditation
4) Camping

Perhaps it is because I feel like I've studied so hard this year and this is my one and only chance to go out and do stuff. Which it is. But what is my greatest fear here? What's the worst case scenario?

That summer came and went without any new experiences. The start of another full school year without having relaxed at all. That's my biggest fear.

Anyways, 2 more papers to go...2 more discussions before my 'summer vacation' even begins. Nose to the grind...