I highly recommend scuba in Honduras. Yes I know they are having a coup right now.. but assuming that blows over before your trip (you said it'll be a few months)...
Honduras has amazing world class reefs which surround their coastal islands. The accommodations, certification and dives are dirt cheap. I was paying only $20-$25 per tank about three years ago and managed to get my open water and adv diver certs for less than $250 combined.
Utilla is your best option as it is the cheapest island and is pretty much 100% devoted to diving. In fact if you're not diving their is little else to do there.
Here's a blog entry from my trip there.. maybe it has some info for ya.
www.worldtravelblogs.com/component/conte...-central-america/318