Guam operates on Chamorro Standard Time, ten hours ahead of UTC with no daylight saving changes. Antonio B. Won Pat International Airport sits in Tamuning, handling direct flights from Tokyo Narita, Seoul Incheon, Manila, Taipei, Hong Kong, and select US mainland cities including Honolulu. Japan Airlines, United Airlines, Korean Air, and Philippine Airlines maintain scheduled service. The airport lies four kilometers from Tumon Bay hotel district. No railways exist on Guam. Public bus service operates limited routes primarily serving local residents rather than tourists. Rental cars require valid driver licenses from home countries for visitors staying under thirty days. Traffic moves on the right side. Route 1 circles the island as Marine Corps Drive in the north and connects south through Hagåtña to Umatac. Route 4 crosses the island interior between Hagåtña and Pago Bay. Taxis operate from the airport and major hotels without metered service, using fixed zone rates set by territorial regulation.
The United States dollar serves as legal currency. Banks include Bank of Guam, Bank of Hawaii, and First Hawaiian Bank with branches in Hagåtña, Tamuning, and Dededo. ATMs appear at hotels, shopping centers, and gas stations. Credit cards see wide acceptance at establishments serving tourists. Tipping follows American standards with fifteen to twenty percent customary at restaurants. Sales tax does not apply, but hotel occupancy tax adds eleven percent to room rates. Electrical current flows at 110 volts with sixty hertz frequency using American two-flat-prong or three-prong outlets. Time zone GMT+10 means Guam sits fourteen hours ahead of New York during Eastern Standard Time, eleven hours ahead during Eastern Daylight Time. Guam sits one hour ahead of Japan, two hours ahead of South Korea, and sixteen hours ahead of London.
Mobile networks operate through GTA, IT&E, and Docomo Pacific using GSM and LTE bands compatible with most international phones. Coverage reaches all populated areas with weakening signal in jungle interior. Prepaid SIM cards sell at airport kiosks, convenience stores, and carrier retail locations. Hotels and restaurants in Tumon and Hagåtña offer WiFi. Internet cafes exist but have declined with smartphone proliferation. Postal service operates through United States Postal Service with domestic rates applying despite Pacific location. FedEx and DHL maintain offices for international shipping. Hagåtña central post office sits on Route 8 near the Plaza de España.
English and Chamorro share official language status under Guam law. English dominates in business, government, and tourism while Chamorro persists in villages and cultural contexts. Public school instruction occurs in English. Tagalog speakers number substantially due to Filipino population. Japanese appears on tourist signage in Tumon. Korean language services increased during the 2010s with visitor growth from South Korea. Hospital emergency departments and police provide translation services for major languages.
Guam Memorial Hospital in Tamuning serves as the territory's primary acute care facility with emergency department, surgery, and intensive care units. Naval Hospital Guam on Naval Base Guam treats military personnel but accepts civilians in emergencies. Private clinics operate throughout Hagåtña, Tamuning, and Dededo. Pharmacies include outposts of American chains CVS and Walgreens plus independent locations. Prescriptions from US physicians transfer directly. Prescriptions from other countries require local physician consultation. Dengue fever cases occur with peaks following rainy seasons. Brown tree snake population reached ecological saturation by 1980s, causing bird extinction but posing minimal human danger with mildly venomous rear fangs rarely causing significant envenomation. Coral cuts risk infection requiring cleaning and monitoring. Coconut rhinoceros beetle arrived 2007, damaging palms but not affecting visitors. Tap water meets EPA standards for drinking.
United States citizens and nationals enter without passports, using government-issued photo identification for domestic air travel under Transportation Security Administration rules. All other nationalities require passports. Guam-CNMI Visa Waiver Program permits citizens of certain countries including South Korea, Taiwan, Singapore, and United Kingdom to enter for up to forty-five days without US visa if arriving by air through designated carriers and meeting specific conditions. This operates separately from ESTA and US Visa Waiver Program. Standard US visa requirements apply to nationals outside this program. Overstaying carries federal immigration consequences. Official information appears at guamcustoms.gov and uscis.gov. Customs inspection applies agricultural restrictions identical to Hawaiian regulations prohibiting entry of most fresh fruits, vegetables, and soil.
Police services fall under Guam Police Department with headquarters in Hagåtña and precinct stations in Dededo and southern villages. Emergency number 911 connects to police, fire, and ambulance dispatch. Tourist crime concentrates in vehicle break-ins at beach parking areas and hotel area theft. Violent crime against tourists remains infrequent. US federal law applies alongside Guam territorial code. Military security zones at Naval Base Guam and Andersen Air Force Base restrict access. Unexploded World War II ordnance occasionally surfaces in jungle areas, marked with warning signs.