Safety and Precautions
Malaria and other mosquito-borne diseases are rare in northern cities, but if you're traveling in the jungle during the rainy season (from June to October), consider taking antimalarials. If you're trekking in the mountains or staying at hill tribe villages, pack mosquito repellent. Spray your room about a half hour before turning in, even if windows have screens and beds have mosquito nets.
Chiang Rai and other communities in northern Thailand are generally safe. However, it's a good idea to leave your passport, expensive jewelry, and large amounts of cash in your hotel safe. Keep a copy of your passport with you at all times, as police can demand proof of identification and levy a fine if you don't produce it. Always walk holding bags on the side of you facing away from the street. In a medical emergency, head to Chiang Rai or Chiang Mai. The police hotline is 191.