You can walk up to and pester really smart people and have a conversation with them. If you have ideas you want to discuss with your peers, this is a great place. Or if you want to hire somebody, or keep your ears out for a better job, it's a great place to network. Give yourself an objective or two over the period of the con, and consider the rest of the time just a way to collect ideas, and maybe sightsee if you get bored. You may also prefer unconferences.