I found another study with pleasing results. It says the sounds of nature can reduce stress. Particularly tweeting birds, the patter of rain or a crackling fire. I guess that would include crashing waves and crickets? I think they sell CDs of that stuff to help people sleep?
But I like the advice from a Boston psychologist that said, "Concentrating is meditative." She advises stargazing because focusing and finding things through a telescope is soothing. I like sudoku, myself.
For more December healthy helpers, here is a link to the Prevention article.