Hey, Ryan -
I know it might sound like people are beating up on you here - we're not, trust me.
What I've found with friends and organizations doing kick-starter type things is that your best resource is going to be your personal contacts. People who know you, people who know your dad, your family members, friends.
At first blush, a site dedicated to the same passion your father has might seem to be a good source. But the truth is, it's kind of like trying to pick up date at a convent on a Wednesday night before vespers.
A really well worded e-mail to your friends and family that includes a call-to-action and some phone calls to make sure they've been directed to the site will very likely put you at your goal. Truth be told, considering what he's already put into it, what you looking to fund is the entry fee, fuel, hotel and meals. If your e-mail and correspondences were to spell out what your father has already invested in this project, and your passion to help him were clearly demonstrated, I suspect you'll make that 5G goal pretty easily.
The biggest mistake I see with these type of fund raising efforts is that too often, the organizer tends to let the Kick Starter do all the work. It's only a tool - it still requires an operator.
Good luck Ryan.
Sincerely
Chris Conrad