the only real "backpacking" experiences i had were in southeast asia (thailand, laos, cambodia, vietnam). ironically, im from the philippines, which is also in southeast asia, and i also love backpacking among the unvisited islands in my country! it's like travelling to different countries upon landing in one island! they speak totally different languages... different from my hometown's!
backpacking in japan is also great especially in shikoku (five times!) and kyushu (twice!)...
ive been to australia (twice) to stay with my relatives... germany... austria... taiwan... china... korea...