Thailand is not an expensive destination. It is a cost-effective country to travel around. For a lot of things, Thailand is very affordable. Moreover, Thailand can suit all kinds of budgets, from economical to luxury.
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So bring 20000 Baht for 9-10 days visit. To have a reasonable budget, I would suggest to plan for 2300 Baht per day per person for food-drink-transportation-tour etc, making it around 32,000 Baht for two weeks.
Visit the Royal Thai Embassy website for the most current visa information. U.S. citizen tourists entering Thailand for fewer than 30 days do not require a visa. We strongly recommend that your passport be valid for at least six months beyond the date of your arrival in Thailand to avoid possible denied entry.