If you don't want common places than go to Phuket, Coral Island and if you are adventures enough and have some extra time
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The traffic situation is pretty bad in bangkok, so I suggest you take a ferry to hop to various attractions. That way you'll be able to cover more and experience the sailing part of it too. Frankly, you'll get tired of seeing temples one after the other. Some of the must see attractions are: 1. Wat Pho 2. Bangkok Palace 3. Take the Chao Phraya dinner cruise 4. Chatuchak market Other attractions depend on the kind of activities you'd like to do. You can totally skip Chinatown. And I suggest keeping one day for shopping cause you'll go crazy shopping. thanks