Yes, sadly, it is very difficult to prevent tourism from impacting the environent. Every time people get the information about a very beautiful natural place then everybody tend to go to visit and the environmental degradation is sure to beguin.

https://www.google.co.ve/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjM6oLwj5vdAhUttlkKHadpD9kQjRx6BAgBEAU&url=https%3A%2F%2Fourinfiniteearth.com%2Fconservation-awareness%2Fworlds-coral-reefs-gone-30-years%2F&psig=AOvVaw1Lt5u84Q6G0Xnw8ctAJ2U-&ust=1535936568916517