So there's these polar bears... (Just kidding)
Isla de Plantas Asesinas (translates to Island of Murderous Plants):
This island has been isolated for centuries, with no human so much as stepping foot in the sand since it rose from the ocean floor. When that was, nobody can tell. This place was first discovered by a British vessel, and the captain insisted upon half of the crew coming with him onto the shore... They didn't even make it to the treeline. Well, not on their feet, that is. What they thought was driftwood knocked them off their feet, and vines quickly wrapped around their legs, violently pulling them into the jungle. One crew member acted quickly, pulling his sword from it's scabbard and slicing through the vine. What could only be described as the shriek of a banshee came from what seemed like the island itself, freezing the man with terror, as well as the men still aboard the ship. Vines wrapped around his knees, stomach, and head and violently slammed him into the sand. And then further. The crew remaining aboard the ship wished to stay one more night, to see if their comraddes would return. They rowed a small boat to the shore, not daring to touch the sand. They waited all day for any sign, to no avail. Finally, that night, they heard cries in the jungle. They pleaded with their crew mates to save them, for they were wrapped within grass, vines, and the dirt or wood they were up against, they were slowly sinking into. Needless to say, the crew of the ship that weren't trapped on the island sailed away. The men spread their tale to all they could, with horror in their voice. Some brave fools have attempted to brave this place's deadly vegetation, but no one has ever returned to tell what they found.
If this were to have a quest-line pertaining to it, it'd be very high level and one of the popular NPC's would have traveled here and gotten trapped, leading you to save them.
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The whole island is diseased with treacherous plants, you must work to cleanse it. Work your way through the jungle, towards your comrade's cries. If you must, bring a torch and light the jungle ablaze, though that may anger the flora more. When you do finally make it to your friend's aid, they are near death and you must revive them. Find fresh water, for you do not wish to partake of any fruit on this forbidden rock. When revived, flee to your ship and sail away to live another day.
(Little over, sorry about that.)
Found it here:
https://stockfresh.com/image/1319871/uncrowded-tropical-island-shore