I was very skeptical and nervous when I went to Thailand at the beginning of the year as I had heard many stories about people being scammed. It was also my first time overseas and I was unsure of what to expect.
My suspicions were confirmed when I arrived in Thailand as I discovered that someone had rummaged through my belongings. Luckily I had kept all my valuables in a pouch tied around my waist (passport, money, credit card). I suggest you do the same.
Eating in Thailand may seem simple - there are food stalls everywhere, but be very careful where you order your food from, especially if you are eating off the street. Make sure that you buy food from the street stalls were the food is busy being cooked, otherwise you can get terribly sick. Besides that, you might end up eating something that you have no idea what it is. I am pretty sure that I had a pigs ear or two whilst eating off the street!
Another suggestion I can make is to always ask for a taxi with a meter. Many of the taxi drivers take their chances and will overcharge you if you do not ask them to put the meter on. Most of them, especially in Bangkok do not speak English very well, so I would look up a few common Thai words and write them down.
Do not trust anyone, no matter how friendly they seem ( and Thai people are very friendly). Do not dive head first into a situation without thinking through things carefully and asking another person's opinion.
You should be alert when travelling in Thailand, but don't let it stop you from having a good time. I had a fantastic time in Thailand and will definitely be going on holiday there again soon
[ Edit: Edited on 11-Oct-2010, at 11:51 by Arl ]