we spent 4 days 4 nights in Langkawi. we have booked a mangrove tour through a unknown tel.no that was introduced by a resturant. that was RM170 at first, then we asked for a lower price as it was not in high season. that man cut it to RM150, we dealed.
i find a link about our trip for you
Mangrove boat trip:
http://www.langkawi-nature.com/langkawi ...
it was an amazing trip as i haven't been a forest before. the tour guide explained how the mangrove rain forest protected Malaysia against the horrible Tsunami in 2005 X'mas. now i really feel that Malaysia is very rich of nature resorces. Trees are strong and tall, funny monkeys gazed at us for food. monkeys can swim well! but i don't like them as they are greedy and rude.
Tour guide has rich knowledge of nature, just ask them if you have any questions. they will talk a lot and you will learn more.