Holidays as rest time?

Lifehack wrote a while ago about Summertime: Rehab Time for Workaholics.  I (and certainly others) would class myself as at times being a workaholic.  That makes the holiday times really important.  I need to be refreshed, but at the same time I still have a thirst for achieving.  For me that always leads to the question of balance: I need to sleep lots but at the same time how do I feel achievement – is it through reading books, playing sport?  Who knows, something to think about.

What do you do about resting and holidays?