bahamas will provide shots at a few bones, some of epic proportions, but it will be tough, monotonous with rewards few and hard earned. xmass island (you might want to check the thread on this one) will provide, literally, hundreds of shots at bones every day. if you catch on to spotting these fish, you can hire your own guide and truck, for not very much money, and take on the lee side. IGFA sized bones and trevally inhabit this reef along with monster sized gray reef sharks. challenging hunting with some rewarding fish. trouble with belize is the wind. if its up you can blow an entire week without a chance to sight fish, or it could be perfect and you hook up on every cast, a crap shoot. have never fished ascension but have heard from friends about baby tarpon, permit and small bones all in the same day. the keys are still a great place for sight fishing tarpon but it is crowded and lots less appealing than it was 20 or 30 years ago. however, if you have not done this one, i wouldn't take it off of your list, late may-early june. you can also combine this with a flight over to the bahamas for a twofer. i have done this a couple of times and it was easy and broke up the trip quite nicely.
have fun whatever you choose. for me, i will be returning to the osa pennisula of CR. off shore for bills, inshore for snook and roosters. fantastic people and locale combined with knowledgable skippers stirred with wonderful local beer and rum........