I don't know that there is a problem. It is your website, and you may develop it however you wish.
From our point of view, we've got 187 websites already listed for Sanibel -- categorized and (more or less informatively) described: check out
http://dmoz.org/Regional/North_America/United_States/Florida/Localities/S/Sanibel
which is sort of like what WE'D call a "comprehensive guide." You have ... a one-flap travel-brochure hype-heap wrapped around a dozen or so links. My initial reaction was, "which syllable of 'inadequate content' didn't you understand?"
Now, my second reaction was slightly more favorable, when I checked and discovered that we did not yet have several of your links. (I added THEM to our suggestion pile, and for them I thank you unreservedly, and apologize for a large portion of my original reaction.) But -- in my judgment our surfers would be benefited far more by your links in our context than by even ten times as many links as you have in the kind of context you're building.
I'll give the usual spiel: develop your site as if the Open Directory had never existed, and you had to communicate directly with surfers, in the face of competition from larger, older sites with legions of editorial staff writers Yahoo listings to boot.
If you can show you can swim with the sharks, then you're likely to get an ODP listing -- not when your site can't survive without it, but when the ODP cannot survive as a comprehensive resource without a link to your site. (Frankly, 95+% of wannabe-guides can't do this. I'd give you slightly better odds than the average, but still bet against you. You've still got a lot of writing to do, and also a bit of learning about the difference between information and hype. But I've seen worse. And you are right to start with a very small geographic focus.)