tutorial showing how to isolate a part of a pic to lighten it?

hello,

 

I have a seascape photo with an island in the middle of the water. think of a black triangle surrounded by sparkly waves. I want to isolate the exact shape of the island so ONLY the island can be lightened a bit. Is there a nice video tutorial showing what that process is? tried some things in photoshop like the lasso tool but I could not get the island shape traced exactly enough. something similar in Photo paint?

 

thanks

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