good tennis shoes are perfect for this trip. If you plan to hike on trails it would be helpful to have a pair of hiking boots, especially during the months of May, October, November and December. It can be muddy then. It is always warm in Granada and humid. Dress the way you prefer to under such conditions. Loose cotten stuff and shorts are very acceptable just about anywhere there. Nights can be cooler. Night clubs and fine dinning establishments would prefer to see their foreign guest dressed at least, nice casual.
Granada has anything you might need so you don't need to bring your whole medicine chest. Bring the important stuff, you know better then I what you need, and leave the rest behind knowing you can get it in Granada. Most prescripcion drugs in the States can be purchased over the counter in Nicaragua. I have found nothing more potent in reversing an upset stomach, either because of bacteria, stress of changed environment or whatever the reason, then pure honey. I am not talking about the honey you pick up in the grocery store. You need to get unpastuerized honey. Lots of health food stores in the States sell it. Get a small bottle of it and bring it with you. It makes any other medication, over the counter or prescription, look like candy compared to pennicillin in fighting an infection. Sometimes an over the counter med is needed to get diarreah under control, but the honey can work sinergistically with any med without a counterindicatory action. Asprin/Ibruprophen are standard travel companions of mine.
As long as you don't plan on leaving your stuff unattended bring whatever you like to shoot with. Nicaragua is like one of the most beautiful man or woman in the world...its hard to take a bad photo here. The better the equipment the better the shot. Camera equipment and supplies are readily available in Granada.
Mosquito repellant and whatever else you like to bring when camping. Just remember its hot most of the year around. Can rain like you've never seen befor in May, October through December.
