Go on a sandhopper hunt - a sandhopper is not a flea, though it jumps like one. It is a relative of the shrimps and barnacles. Search for them under high-tide debris, and in a tidepool. Most choose a special home. Go birding on the beach - beaches attract people and birds for different reasons.
People are there for sun and fun, birds for food and rest.
Look carefully to see how they differ from forest birds and those that swim. Wait a while to see what they seek as food. Wading birds have long legs and big feet to help them stand still. Shoreline birds have short and sturdy legs. Listen to insect songs - on hot summer days or evenings, insect 'songs' are often heard.