Dos and Don'ts in Thailand

• Don’t leave home without travel insurance, and ensure that it covers both medical treatment including medical evacuation to the UK and unexpected losses/ expenses (eg missing flight, losing passport, having cash and credit cards stolen). Accidents and robberies do happen in Thailand and the health risks are greater than in Europe.
  
  
• Do bring enough funds for your stay and your return. Bank transfers can take time and if you miss your return flight, you may have to purchase another ticket to get home.
  
  
• Don’t get involved in any way with drugs.  Penalties are very severe from 10 years up to the DEATH penalty for trafficking. Don't carry anything through customs for someone else unless you know exactly what it contains.
  
  
• Do remember the real risk of AIDs/HIV. Condoms made by recognised multi-national companies are widely available locally from pharmacies.
  
  
• Don’t have sexual relations with minors. Thailand regards such acts as rape.
  
  
• Do take care of your valuables at all times. Don’t let them out of your sight or leave them unattended unless you are sure that they are safe. Do be on your guard against pickpockets and bag/snatchers as you would in any busy tourist resort and never accept drink or food from a stranger, they may be drugged. Do report any loss immediately to the nearest tourist police.
  
  
• Don’t buy gems, except from a  reputable dealer. It is not illegal to sell inferior quality gems at inflated prices. You might return home to find that your gems are worth less than you paid for them. Don’t hand over money for any goods which are to be mailed on to you, or have yet to be made to your specifications (though a deposit is usual). If you must post purchases home, then do it yourself.
  
  
• Don’t overstay your welcome. You are automatically fined for each day you remain in Thailand beyond the date stamped in your passport. If you cannot pay, you could be arrested. Do reconfirm your return flight.
  
  
• Driving conditions are very different from those in the UK and most vehicles are not insured, be particularly aware of other road users. Do be careful if you hire a car or motorcycle. Don’t use firms which are not prepared to give you full insurance cover. Do wear a crash helmet on a motorcycle.
  
  
• Don’t get isolated in remote areas, especially after dark.
  
  
• Do bear in mind local religious and cultural sensibilities - if in doubt, take local advice, especially with regard to topless or nude bathing.
  
  
• Do respect Thai customs. Buddha images are sacred and should be treated as such, even by foreigners. The Royal Family are held in high esteem and Thais will not tolerate foreigners being disrespectful towards them.
  
  
• Don’t use a guide who approaches you on the street, even if he appears to have genuine credentials. He may be a trickster.

For more information Please visit this Link
British Embassy Bangkok you will find lots of useful informatiom on living, working and traveling in Thailand.