I would start a blog, get a domain name and hosting, put wp on it, then put a nice theme on it, then advertise it with teh rest of the money you have left over. i really want to start a blog, but right now just do not have the money to do it.
After deciding on the best keywords to use, I would use it on something like Google AdWords to send targeted traffic to my website. No one can say for sure, but I think that the extra advertising could result in a return significantly more than the amount of the original investment.
i'll put it in my pocket, and run for the woods where i will live as a hermit for the rest of my life