Thought I'd toss this in here, since I got a mental picture and wanted to share... feel free to use or discard as you please:
The island is, in the strictest sense of the word, tropical. The jungle that fills in in the centre is thick and lush, heavy with heat and humidity during the day. The sun shines down through most days, though violent, wild storms sometimes pass over, soaking the jungle and feeding livegiving moisture into the plethora of creatures that live there. At night, the island is cool and damp, covered with a haze of mist and fog. The sound of the ocean's gentle waves can be heard all through the island, day and night, combining with the buzz of insects and the rustle of animals to ensure that the place is never completely quiet.
Ringing the island like so many sentinels are volcanos, their fury banked in long slumber. Though they have not erupted onto the island in more years than anyone can remember, their forms still stand guard along each edge of the island, keeping its inner foliage sacrosanct and unmolested save by only the most brave and determined of hunters. Reaching from wide, cliffed bases to peaks that pierce the clouds, the mountains have been the demise of many a lost ship, and countless would-be adventuers have perished along their rocky faces.