Holly: Hope this isn't too late for you, but Mrs. Mac's Kitchen, in Key Largo, has the best onion rings I've ever eaten. It's on the bayside, near the center of town (such as it is,) and is a serious locals' joint. I'm attaching a picture of the fish basket--with the onion rings instead of the fries. However, they are closed Sunday. If you pass through the area then, you might want to slip by Alabama Jack's, out on Card Sound Road.... It's what the Keys was probably like 50 years ago....