Sentence:  Some of the world's best rain forest and volcanic hiking can be found within the <WSD>lush</WSD> canopied Caribbean trail systems. Chock-full of waterfalls and hot springs, bright-colored birds and howling monkeys, flora-lined trails cut through thick, fragrant forests and up cloud-covered mountains. 
Meaning of the word marked with <WSD> tags:  Dense, teeming with life; luxuriant.