Thank you for making out world cleaner. Cleaning the beach is one of the best things you can do at the beach.
I'm all for the raking of the sand, but there is just so much more trash that isn't easy to spot. The dirtiest places you will find are when it gets a couple meters deep and out of the range of most hardworking people. If you ever want to go the extra mile, organizing a clean up with the local scuba club, or even using a snorkel helps.