Become a frequent flyer. Since airfare is the most expensive part of visiting Thailand, consider enrolling in a frequent flyer program that has a mileage earning credit card. Sign up for email alerts about special discounts.
Decide whether you would prefer a budget hotel or a hostel. For Thailand hotels, visit http://www.sawadee.com/For hostels, visit http://www.hostels.com/en/th.html
Choose meals for small restaurants. Even some of the street food stands have excellent, affordable meals.
Shop at street stalls as opposed to major stores and malls. There are great bargains to be found.
Choose from many of the free attractions, such as the Khao Lak Police Boat, which was washed ashore during the Tsunami.