I just returned from AC on AUg 9th and did some wondeful Tarpon/Bonefish/Permit fishing. My friend had a grand slam the first day. Many hook ups on Tarpon but few landed, thats the way sometimes. We stayed at El Pescador(Northern AC) and the service was incredible. It was their off season but still the hospitality was great.
All of the guides there are incredible. Carlos(our guide) is a very patient man to deal with us learning "how to" in such a short time.
Some days are hot with fish, others are not so good.
Fly fishing is your greatest bet for hooking up. Hope you can "double haul" a 12 weight rod cuz thats all that can handle the big ones. . I hooked up to one in spinning gear but it was a a mishap.
All in all, try for Tarpon but if the weather is uncooperative, then Bones(8 wt. gear) are the next best thing.