For my thesis, I had a 'Summary and Recommendations' chapter, rather than a conclusion chapter. My data chapters did a good job of covering off on most of points that Meaninginlife listed. However, the chapter was a good place tie everything together and address the objectives/research questions from the introduction chapter. The recommendations were the most enjoyable part to write of course. I even had a section called 'Contribution to Knowledge', which was a nice opportunity to remind the examiners about the original nature of the work.
Have a chat to your supervisor, as they may have suggestions about how you should structure your final chapter.