"Kawa no nagare no youni" is one of the most famous Japanese songs. Here's a mp3. This remix is a bit cheezy and overdone but it's the only one I could find.
And here goes my attempt at translating it.
知らず知らず 歩いてきた (Without knowing, I have walked here)
細く長い この道 (Oh, how narrow and long, this road)
振り返れば 遥か遠く (If I turn and look back now)
故郷が見える (I can see my hometown, far far away)
でこぼこ道や 曲がりくねった道 (Over bumpy roads, winding roads)
地図さえない それもまた人生 (Without even a map, but again that's life)
ああ 川の流れのように ゆるやかに (Ahh, like the flow of a river)
いくつも 時代は過ぎて (Gently do the times pass us by)
ああ 川の流れのように とめどなく (Ahh, like the flow of a river, ceaselessly)
空が黄昏に 染まるだけ (The sky becomes dyed with twilight)