Your disclaimer has some conflicting/erroneous information:
"IT IS ILLEGAL TO JUMP FROM ANY HEIGHT (MAN MADE OR NATURAL STRUCTURES" O rly? Says who?
"Big Swings is in no way liable for any persons actions." You do realize that simply saying something does not make it so, correct? That would be like me saying "I am not responsible for the death of OP when I cut his throat."
"You may not submit information from a third party source unless you have express
permission from the copyright owner." Hmm...I would say that somewhere between 99.9% and 100% of third-party cliff jumping info is not copyrighted, and what is out there is meant to be shared.
"Seriously, this is as dangerous as it gets." Really? Really? What about BASE jumping? Playing chicken with a train while on a tricycle? Sharing needles in downtown LA? Any number of other activities...
Also, why not put the info on your website? I'm not interested in downloading your app but wouldn't mind seeing what you have compiled. I might even contribute if I know of some that you don't have. The app is fine, if that's what you're into, but what would be lost by putting the info on your site as well? I'm thinking what you have is basically a copy of swimmingholes.org, which has been around for quite a while.
That's just some constructive criticism.