http://www.eurotrip….
Also here: http://www.eurotrip…. — but bring some major currency just in case ATM networks are down, ATMs are out of cash, your card suddenly doesn’t work, gets eaten, etc. Personally, I would bring about $200 USD or equivalent major currency if I was landing some place where I knew absolutely no one. I’d only convert it if my ATM or major credit card didn’t work for whatever reason.

Learned this from a former diplomat who traveled almost continually. The basic packing list is:
Tickets
Passport
Plastic

I’d add Don’s emergency cash stash.

You can buy anything else you absolutely need.

Before you go you may want to advise your bank/credit card company of your trip…my wife had her credit card cancelled after they noticed unusual activity on her account (.i.e her buying clothes in Italy).

MP3 player/IPod; Rather than paying for a guided tour, before I go I download guided walking tours onto my MP3 player. Lots of places also have podcast tours that you can access. I also put pictures of my own city on my mp3 player to show to people when I’m traveling…great icebreaker

Ear Plugs, so noise doesn’t bother you when you are trying to sleep.
Small roll of duct tape. For a million uses, but for me the most important is avoiding blisters on my feet. I walk a lot and sometimes a shoe rubs me wrong. So I just put a small piece of duct tape on my foot where my shoe is rubbing. Do this BEFORE the rubbing creates a painful blister.

Definitely ear plugs…street noise in large cities can be extreme….everyone rides those scooters or, even worse, noisy dirt bikes. There’s a reason most smart travelers try to get rooms that don’t face the street or are directly across from a church (ding dong church bells all night long)