That point is in the sea southwest of Cuba, in the territorial waters of the Cayman Islands,
about 102 miles northeast of Georgetown, and 169 miles northwest of Montego Bay, Jamaica.
Cuba
20 N 80 W is near Cuba.
20 N 80 W is in the Caribbean Sea, between the Cayman Islands and Cuba. As the question states an (single) island! I must assume that it is the single island of Cuba.
You're in the vicinity of of the Cook Islands, about halfway between Rarotonga and Mangari.
The equator
Cuba
That point is in west-central Jolo Island in the Philippines.
20 N 80 W is near Cuba.
In the Caribbean Sea.
20 N 80 W is in the Caribbean Sea, between the Cayman Islands and Cuba. As the question states an (single) island! I must assume that it is the single island of Cuba.
13 S 16 E is Huambo, Angola, Africa (not an island country).
There is no island located at these coordinates. The Free and Sovereign State of Sonora in Mexico is found here.
0 degrees
You're in the vicinity of of the Cook Islands, about halfway between Rarotonga and Mangari.
0 Degrees
The equator
Rain forests of any kind would not be found past 30 degrees latitude.