Zeppelin is a nice choice. If I were to bring along the ipod, I'd be down for a little Zeppelin, Floyd, too.
I like to find that comfortable spot in the sun...then I just sit. Still, quiet, eyes closed; I might as well call it a quiet meditation, as I just sit, breath, and listen to the sounds around me. After, if I've packed it in and depending on the time of the day, a little sip of something special is nice, too.