I will perhaps be villified for mentioning this but Caye Esperanto, (etc) was highlighted in the Tempations series. Regardless, you should be able to find info here through using the search mechanism and I'm pretty sure that Lan also has it on his site.
No matter what, have a great honeymoon. And remember, don't worry about taking an ABM card. Take cash, travellers' cheques and a credit card. You will have NO WORRIES.
I always take $500 US just to get me started. The rest in $20-50 travellers cheques. Never have any trouble cashing them unless I try to do it at the bank. :^)
I've only used my credit card a couple of times (cuz I'm like that) and there has never been a problem during the initial transaction or after I got home and checked my bill.
The only time there was the least bit of concern was when I purchased my airline ticket with my credit card and the credit card company phoned me to see if I'd done it. I was surprised but gratified. So the good plan is, tell your credit card company that you are going on vacation before you leave. Put everything on your card and don't worry.
That said, it is nicer for everyone when you are using cash at Iguana's and the Jaquar.
A fish and a bird can fall in love, but where will they build their nest?