asalam alaikum wr wb,
the island is not a very pleasant one, and the description has to be like misrable, and scary ..etc...
Here are some ideas...
1) the air was thick with the smell of decaying woodland
2) masses of dead reddish brown seaweed littered the beach like rotting corpses
3) jagged rocks of raven black jutted out from the murky waters, their sharp contours chiselled into defiant faces
4) the hands of time had cruelly stripped the island of it's beauty and tranquility, leaving a sense of forboding hanging in the air
5) the island seemed dead and yet alive, as if it had sensed my presence and was warning me of evil that lay ahead (or) as if it sensed an intruder and was sending out a warning to turn back
6) distant calls of seagulls (or whatever birds) belied the absence of life
7) dark and imposing mountains rose high into the sky casting gloomy shadows deep into the forest, it's deep and dark crevices mocking as if hiding stories of untold misery
8) the trees stood silent yet seemed to sway hypnotically in my peripheral vision, their thick but ravaged brances reaching out like the arms of an anguished lover
9) the island's eerie silence was like that of a partially deaf man listening attentively for any sound
10) the stench of rotten eggs caused by the algae rose over the lake like bad souls wandering aimlessly
a) The lake itself seemed fathomless and unforgiving
b) it's waters reflected a surface that appeared inviting yet impenetrable at the same time; as if once you'd surrendered to it's invitation, it would never let you resurface again
11) muhahaha lol *snaps fingers* wake up :p
hope that helps?
wa alaikum asalam wr wb.