A new study analyzed 50 lesser-known beaches in the U.S. to identify the quietest, most relaxing ones.Avila Beach city promenade filled with restaurants, shops, patios, benches, and art.Credit: Nature, food, landscape, travel/Getty ImagesAs we near the final days of summer, it’s time to start thinking about how to take advantage of every warm weekend ahead. A trip to the beach is a good place to start, and thanks to a new study by HelloMillions,…