Drink lots of water. Never drink tap water purified, bottled water is available everywhere.
Use an insect repellent against mosquitoes. It is the only way to be sure of protection against mosquito borne diseases. Since Cambodia has a hot and humid tropical climate, casual and light-weight clothing is best. Clothing made from natural fibers is the best option. A jacket might be needed on cool winter evenings or in hotels and restaurants using excessive air-conditioning. A hat and high-factor sun block is advisable as protection against the hot sun when sightseeing.
When visiting temples or pagodas, including those of Angkor Wat, shorts and T-shirts are acceptable. Shoes are generally removed at the entrance to pagodas. For visits to the Silver Pagoda, which is within the Royal Palace grounds, visitors are asked to dress more formally. Gentlemen are required to wear long trousers and ladies should wear long trousers or long skirts.
Standard film, (such as Kodak, FUJI or Konica 100), slide and digital camera memory are widely available. Photos are inexpensive to process in the country. Any specialized photo equipment should be brought with you. Photography in airports, railway stations and near any military installations is forbidden and discretion should be used when photographing people, particularly monks. The cheapest & best quality photo service in Phnom Penh is SPK Photo Studio FUJI Shop at Monivong Blvd.
The weather in Cambodia generally falls under two categories: the wet season (May to October) and the dry season (November to April).
Lightweight, loose-fitting, cotton clothing is recommended for the dry season, when the weather is hot and humid. Visitors may wish to pack long pants and long-sleeved shirts for hiking, trekking, or outdoor activities. A hat and sunglasses may be useful for when walking around under the sun.
During the rainy season, visitors may want to bring a light rain poncho (plastic ponchos can be purchased cheaply in Cambodia) or a sturdy umbrella. A light jacket or cardigan will come in handy during the months of December and January, when temperatures are at their coolest.
When visiting outdoor temples, including those of Angkor Wat, shorts and T-shirts are acceptable. Shoes and hats are generally removed at the entrance to pagodas. For visits to the Silver Pagoda, which is within the Royal Palace grounds. visitors are asked to dress more formally. Gentlemen are required to wear long trousers and ladies should wear long trousers or long skirts and keep their shoulders covered.
Although no vaccinations are officially required for entry to Cambodia, they are highly encouraged. Visitors are advised to check with their doctor or a travel immunization clinic regarding protection against malaria, typhoid, tetanus, hepatitis A and B. Any essential medications should be brought with you as there is no guarantee they will be available in Cambodia.