Clothing
Cut down to the bare minimum when packing clothes. You will need to get used to wearing the same clothes for long periods of time. Or you can wash and dry clothes overnight in most places.
It is advisable to take:
3 T-shirts ideally these should be fast drying so that they can easily be dried overnight.
3 longsleeved shirt or polo shirt It is vital to have at least one long sleeved item of clothing for protection from mosquitoes and the sun/cold.
2 pairs of trousers the most useful type are lightweight trousers with plenty of pockets OR TRACK PANTS. 1 pair of long-johns for use as pyjamus on cold nights.
2 pairs of shorts for kayaking.
A good jacket/windbreaker is a MUST. This can be layered with other clothes to keep you warm. It can get pretty cold at night. A glove might be a good idea too.
It is worth taking 3 sets of socks and disposable underwears for 15 days. For socks, you will have an opportunity to wash them while you are there so it is not worth taking up room bringing loads. Also bear in mind that anything you take that is white is not going to stay that colour for very long!
Because there is quite abit of walking, wear a seasoned pair of trek shoes.
A pair of sandals are essential. They have the advantage of being small and easy to pack and can be quite comfortable for most occasions.