A good friend of mine keeps asking to workout with me and go on vacation.  I told him that going to the gym is my time that allows me to clear my mind and I would not mind going on vacation.  However, I love vacation, but sometimes when I'm on vacation I just like to relax by the pool or beach having a drink.  It reminds me of this from Henry David Thoreau:
" I find it wholesome to be alone
the greater part of the time.  To be
in the company, even with the best
of friends, is soon wearisome and
dissipating.  I love to be alone. I never
found the companion that was as
companionable as solitude."
Although we are sociable by nature, we always need time to ourselves.