Recently, I was garden touring in Cancun, Mexico. Every morning and evening I took time to walk several miles of the shoreline to check out the plants.
The hotels along the shore had dedicated staff to keep the surf and the sand trash free.
During my visit I planned to Scuba dive. The clean shore set up the expectation that the water would be trash free. The dive conditions included great visibility and trash free water.
Around the world trash plagues oceans and shorelines. Research has shown that the man-made environmental trash crisis begins inland. A shoreline crew member explained depending on weather and wind conditions trash can float in from somewhere at anytime.