Handling feral cats is a very tricky business, but they are a "menace," as someone else dubbed them, created only because humans treat their pets as disposable and "let them go free," when they get tired of taking care of them ... Which really equates to leaving in them the wild to starve or otherwise die violently. Your instinct to help is admirable, and totally possible, but you must go about it the right way.
And the odds you'll become ill or die due to a scratch are roughly the same as winning the lottery.
The best, and most humane, way to cull a colony of TRULY feral cats is trap-neuter-return. You trap only the males (females are released immediately, without handling), have them neutered and then release them back WHERE YOU FOUND THEM, again, without undue handling. You take them in the morning, or the night before, and they're ready to be released that evening, with zero recovery time. Many rescues and clinics will do it for as little as $10-$20/cat. The colony will then die out very quickly. You can get rid of a 50-cat colony in less than six months, simply by neutering the males. The life expectancy of these cats is extremely short.
Trapping these cats and taking them to animal control will ultimately just lead to them being immediately put down, as no organization will even attempt to re-home a feral cat, when there are millions of non-feral cats needing homes.
The idea of whether or not to provide them with a food source is a mixed one. Some rescue groups strictly advise against it, while others say it doesn't really matter. The studies I've seen say that colonies with a human-provided food source that have been part of trap-neuter-return programs, survive only marginally longer than those left on their own, so providing food for them isn't the largest issue. The danger would be eliminating one colony only to trade it out for another, if another group finds the food source, but cats are territorial and while one or two will join a group, colonies tend to remain distinct (like wild cat prides).
For real information, check out reputable local rescues or start with this ASPCA FAQ on feral cats:
http://www.aspca.org/adoption/feral-cats-faq.aspx, or this step-by-step guide to helping feral cats from the respected Alley Cat Allies:
http://www.alleycat.org/document.doc?id=461.
There is a lot of really, really good information online about how to help. A vacation planning Disney community isn't really the first place I'd look for it, though.
Best of luck, sincerely.