What to do in Jakarta, Indonesia

Jakarta was an unplanned and last minute trip for me and the missus. Her sister and brother in law were travelling from Sydney to Jakarta for a wedding, and we thought, well why the hell not. We are only an hour and a half a way after all. The plane basically lands just after they bring out the food and snacks. Prior to this, all I had heard was that Jakarta was quite a lousy tourist destination. Really bad traffic on the roads, with very little to actually see and do in Jakarta was the main feedback i was hearing....