PDA - with maps, ebooks and MP3s - all on digi storage cards. Much smaller than CDs, more robust too.
Total escape form where you are - read ebook with ear phones playing music.
Also have some poetry, talking books.
"On the road again, just can wait ...
Personally I find absorbing the place I'm at enough to keep myself entertained. However after some 6 months a touch of 'home' is desired. Can usually get that by finding a gum tree somewhere and scrunching up some leaves.
Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S