Okay, the quick and easy answer is 42 (see the hitchhickers guide to the galaxy if you don't follow), but a more serious answer... Well how about a journey for personal enlightenment and fulfilment which can never be completed 'cause the more you learn themore you realise the less you know! OR a damn good excuse for a party!
There is no meaning to life except that which you put into it yourself. There's no big plan or hidden meaning - just live your own life and enjoy the details.
I have to disagree with the assertion that 42 is the meaning of life. 42 is the "Answer To The Great Question Of Life, The Universe And Everything", to which no-one knows the question. So the question CANNOT be "What is the meaning of life?", because that's far too obvious. So think again.