I biked through Golden Gate Park today, and ended up at the ocean. The sun was still pretty high in the sky, and it was warm, so I did some "standing meditation" (a position called The Universal Post in most Tai Chi schools). With the endorphin rush from biking, I found myself in a very nice euphoric state. My mind produced this haiku when I finished:

Quietly allow
the sun, sea, wind and mountains
to enter my soul