Congratulations, Liam! You'll like both, Panama, the Honeymoon, and married life!
One thing you want to make sure to have is dessicant. No matter what, no matter how, but take some with. Panama is extremely humid, so better carry it with and keep your stuff in it for a while after your return. That, or put your glass under the sun for a good week, just to make sure. A friend of ours who is from there told us that keeping VHS tapes usable was a pain, as they get fungus after a while. So, if a tape gets it, don't risk your lenses: have dessicant, or dessicant-working things with.
As for things to be aware of...
1) Never try to photograph policemen, or armed guards or banks (in which these people may work). They're too stressed out and trigger happy.
2) People in Spanish American countries usually don't mind being photographed if they are in a touristy place, but otherwise, just ask for permission first.
3) Don't be surprised if a perfect stranger ask you to photograph him or her. It's happened to me... and there's never any problem with them. They just want you to photograph them; that's it.
4) If you want to photograph people in markets, don't be sneaky, make your intentions known and, if there's no reaction, there's no objection.
5) Keep your gear always near you. IIRC, you have a Domke F5XB bag that will serve you right as it's small and inconspicuous; just make sure you wear it across your chest, and have your wallet in your front pocket, not in the rear one.
I'll ask my wife about those areas you're going to. She was in Panama some time ago, and her memory is better than mine (I went there a looooooong time ago, and only in Panama city; the downtown was then very picturesque).
Funny... you're getting married... and I'll become a dad in a few months. What else is there? 🙂
EDIT: Paul is right. If you can take a bus ride, do it. It's an experience. You may not be able to take a photograph... but then, if you have the right film, get the right exposure and focus, it should be fun. People sing, their bodies keep the beat of the loud music, they sway together and it feels like a very big, packed party. 🙂
