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If you want to permanently have the 5 star rating, you will need to close and reopen your park (say at 1000 guests) all the time. As soon as your guests drop below 6000, the rating will get back to 5 stars Simply close the park and guests will start leaving. You don’t have to build more monorail stations and plaza’s once your rating starts dropping because of your guests. So with 3 hotels, your facility rating will start to take a hit once you go over 6500ish guests For each hotel you have, you can have 2000 guests without any problems.
As soon as you see your rating drop below the 5 stars, check your guest count. Generally one or two of your highest carnivores (keep feeding them smaller dinosaurs to boost their ratings aswell) and one or two enclosures with your highest rating herbivores will do the trick to 5 star the dinosaur rating aswell. You are now free to use the remaining room of your park for dinosaur enclosures. If you do really want to use visibility buildings, make sure they are near your plaza or be prepared to waste more space by building shops close to them. Just leave it at 0% and you will still get 5 star facility rating (you can literally make an enclose in a corner of your park where guests have no way of getting to, drop dinosaurs in there and your dinosaur rating will still go up even though nobody sees them). Don’t bother with dinosaur visibility. Only use the station as main streets / plaza’s where you build hotels and shopping facilities As soon as you build a road from a monorail station and add any building, it’ll count as a connected road, even when there is no road between the monorail station. DON’T BUILD ROADS BETWEEN THE MONORAIL STATIONS CONNECTING THEM! Guests hate walking. At each monorail station, build a straight road and connect a hotel, a restaurant, a clothes shop, an arcade, a shelter and depending on the island also a storm defence station to the road. Choose 1 or 2 other locations for a monorail station, build them there and connect the stations. Make a monorail station near the entrance of your park. This is how you get 5 star facility rating.
And if you are like me, or just get tired of trying to remain stuck at 4 or 4.5 facility star rating on an island, this is how you guarantee yourself the 5 star rating. For me, the 5 islands are just places I need to go through to unlock the dinosaurs and skins to have more variety on my sandbox island.