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The presented maps demonstrate the considerable anthropogenic changes originating from tourist issues. There has been a noticeable and substantial development of the infra-structure throughout the area of the island.
At first, the most extensive change to the island's landscape was the result of building two big buildings (e.g. huge restaurant and reception) and the number of chalets specially designed to accommodate tourists. A consequence of this act was the decrease in the number of palms, probably motivated by the deforestation to construct all these structures.
In addition, other big transformations have been made by building tracks, footpaths and a fancy pierinstalled on the main entrance of the island. Perhaps, a pleasantlocation that you could only walk around or use for bird watching before, has now given way to an island crowded with cars, and a pier with lots of boats. It's possible to assume that the crowds would have increased the noise levels in the area and the boats are dropping more oil near the coast zone.
Finally, although, there was an improvement in the infrastructure of the island, this was at the expense of nature . Maybe, what was once a peaceful paradise for nature's conservation, has now turned into another place for tourists around the world to visit.

Thanks for the great correction!

This is Task 1 of IELTS test. What do you think about expressing an opinion on this task? I assumed after reading it again that there's some own opinion on the description. Is is correct?

Rather than asking for your opinion, it is asking for you to describe what you see. So instead of saying, 'I think that, by cutting down trees to build a hotel, there is a negative impact on the environment.', it is better to say, 'Many trees were cut down to build a hotel. This may have a negative impact on the environment.'