If you will be staying in that country for a longer period (more than 2-3 days) and expect to make local calls, then consider getting a local prepaid SIM card there. It will be a lot cheaper than getting roaming charges on your mobile bill when you get back home.

As for health, consider bringing a supply of vitamin pills on your trip, and taking them daily. I usually bring multivit+minerals and vitamin C which I take daily. Also drink lots of water and keep yourself hydrated. Getting dehydrated increases your chances of falling sick. And if you are going to be getting it "on", don't forget protection! Better be safe then sorry.

I carry my tripod in my checked-in luggage. It weighs about 0.5kg as it is a lightweight Sony model.

I carry 2-5x of 16GB SDHC cards depending on length of trip (1 ultra-fast Class 6 card, the rest are the cheapest I can find - Class 4). My new DSLR is a 12mp camera, and at max reso and highest JPG quality, each 16GB card can fit about 2200 pics. So far I've never even come close to filling up the cards. But with this new camera, I noticed I tend to take many multiple shots especially of scenery/buildings (I have it set at 2.5-4.5fps continuous shots), as this allows me to pick the best pic of the lot when I want to email it out or post it online to FB or elsewhere.

I also carry 10mp point & shoot waterproof camera that uses SDHC cards, so my 2-5 cards are used for both cameras.