There are so many things to do and see. If you can give some information about the type of things you like, e.g museams, outdoors, temples etc, the people on this forum may be able to provide ideas that suit you.
Also, have a look through previous posts, trip reports, and use the search (at the top of the list of forum posts) to research the things that you think you may like, as well as the "Things to do" section on the left side menu.
The best info on the net for SE Asia is Travelfish.org
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