Mm, yeah, I don't quite understand the need for some people to always be BUSY BUSY BUSY! I lived in Germany for a year with a number of host families, and in one of them, my 14 year old host sister (who was a year or two ahead in her classes) insisted on filling her time with piano lessons, tennis lessons, french, english and spanish lessons, more various sports things, not to mention the not insignificant amount of homework she had to do.
I just looked at her busy schedule and thought, I would seriously not be able to cope under that much BUSY-ness.
But when I asked her about it, she just sort of shrugged and said she'd be bored without all that to do. Which makes sense, I guess, if that's your scene.
Given, this whole family didn't exactly see 'relaxing' as a viable free-time activity, but that's another story in itself!