My day is usually pretty full with riding, meeting people, going on side hikes, taking a dip in a river, soaking in a wild hot spring, and generally seeing the sites.
Books...
I usually have either a paperback, an iPod shuffle full of audiobooks, or my Kindle, but I really don't spend much time with them.
Music... If I need music I play it in my head or sing out loud.
Games... I took a deck of cards on the TA, we didn't use them and mailed them home when we were sending other stuff we didn't use. World or Warcraft??? More of a form of mental illness than a game if some of the folks I know who play it are any indication.
Computers... I have carried a tiny 7 ounce tablet to update my journal and read email once in a while. I didn't use it for anything else, but my daughter also used it to Skype. If it was any heavier it would stay home. Even the netbooks are much more than I am willing to carry.