First and foremost, the government should take full responsibility to ensure the coastal areas are safe from pollutants. For example, those who litter there or oil tanks which will pollute the areas will be fined. Rules and laws should be enforced immediately.
Next, a clean-up activity for the coastal areas should be launched in order to enhance the environment there. That way, the countrys own people will be a pat of making the place a more beautiful wonder to behold.
Hope this helps.