.. or make lemonade and wait for your first few customers. Learn from their feedback, improve & iterate. Market to even more potential customers (just like you would have when you first build your park).
I see, but what if I only have a mobile number available for some of my contacts. Will it send them a text asking them to join?
I'm sure it's going to be an awesome app though, I'll happily sign up. I'd like an easier way to take my friends with me. Also, I'd love Twitter integration.