Avoid using plastic whenever you can. Steer clear of things like disposable plastic cups, plastic bags, and any item you don't need. It never breaks down, and has led to the poisoning and death of numerous sea creatures. Look into ways that plastic can be recycled in your area. Some cities have programs for recycling plastic bags and other difficult to recycle types of plastic.
Use resealable, reusable containers instead of plastic wrap or plastic bags.