You could pick much worse ways to spend a day in Kos.
Paradise Beach is sandy, crystal clear, picturesque and sports a fun little bar overlooking its far right shores serving a variety of foods and drinks to sunworshipers daily.
To the far left there's an area called Bubble Beach. Swimming out a few meters puts snorklers in the midst of a very light (coldish) bubble bath. (Unfortunately, I missed this on my last visit... oh well, next time.)
The chairs and umbrellas for rent were €7 for the day.