Peace comes from within, young grasshopper...

Cliche I know, but if you're raging inside even laying inside the most comfortable hammock by the most serene scenery ever ain't gonna do much for you.
For me being peaceful is a state of mind and once I'm feeling it nothing gets to me for a while.

As far as inspiration goes, I just remain aware of my surroundings. There's always something new to muse over if you're in tune to it. Light last night when half the streetlights went out due to the wind and clouds obscured the upper half of the moon I observed it would be a damn creepy setting for a horror survival game.

Past experience has also helped me inspirationwise, especially for songs and the like.
Marijuana seems to bring often stupid limericks to perfect form instantly (probably why I haven't been able to write a limerick in a while now).