Holiday In Bangkok
For some information, it's pretty hard to communicate with people in English, but people are so friendly so don't be afraid. People can understand, some can speak English but for citizens on street you can't hope much. You can use your gesture or learn a bit Thai. It sounds difficult but you can make use of it after 2 or 3 days.
Remember! You should buy at least a Sim card for phone, so it will be easier to communicate if you do not travel alone. Card is pretty cheap, 49 B per card with 50 B credit inside.
ENJOY YOUR VACATION :)