Birds, marine animals and fish can die by swallowing or becoming entangled in plastic. Fishing line can strangle marine animals.
Hooks can injure other mammals, as well as humans walking near the shoreline.
Be careful about what you leave behind. Don't drive on the beach. Beaches are fragile, and the shells, grasses and animals that beaches contain can be crushed and destroyed under the weight of vehicles. Clean up the beach. Pick up trash, even if it's not yours and dispose of it in trash receptacles.