hey bonge... take all of your stuff you have packed and lay it on your bed, split the pile in half and you'll STILL have too much stuff.
I have my wife do that every time we travel and it's worked out great. We went to Italy and the greek islands for a month this past summer and all we each had was a little backpack.
Keep in mind that the only shoes you'll probably wear is a good pair of sneakers for running ( or jungle tours ).. and a pair of flip flops... being a woman, throw in a pair of "nice" shoes.. even though there just not practical down there.
most of the hotels will launder clothing for you inexpensively halfway through your trip.... the lighter you pack, the more fun you have...
plus, you'll need the room to bring back tons of coffee and booze