Tourist Authority of Thailand. The Tourist Authority of Thailand, open daily from 8:30 to 4:30, is heavier on colorful brochures than hard information, but it can supply materials about national parks and out-of-the-way destinations. A 24-hour hotline provides information about attractions, festivals, and the arts. You can use the hotline to register complaints or request assistance from the Tourist Police. 1600 New Phetchaburi Rd., Ratchathewi, Bangkok, 10400. 02/250–5500; 1672; www.tourismthailand.org.