Most visitors to Barbados are not required to apply for a visa; however, travelers are advised to check visa entry requirements for their nationality prior to arrival. US and EU citizens only require a valid passport to enter Barbados, and will receive a 28 day-stay stamp upon arrival. If planning to stay longer, make sure to get an extension, as overstaying is a serious offense and can accrue significant fines. The US state department travel page for Barbados can be found here: http://travel.state.gov/travel/cispatw/cis/cis_1022.html. No vaccinations are required for travel to Barbados.
Health and Safety
Barbados has a good reputation as a safe place to travel and has earned the accolade of being the safest of the Caribbean islands. Violent crime is relatively unheard of, with most reported incidents being petty theft. During the day, visitors can safely enjoy strolling around the island, but exercise caution at night, especially on desolate beaches. The police in Barbados are highly trained and professional should any problems arise.
Visitors should use the same degree of diligence as they would at home. Try to avoid walking alone on isolated streets or beaches at night. Do not wear ostentatious or flashy jewelry and keep cash on hand at a minimum. Make use of the safety deposit box at your hotel to protect valuables and travel documents.
The biggest health issues in Barbados are related to the sun and water. Make sure to avoid heat stroke by wearing a hat and drinking plenty of water. Avoid walking around during the hottest time of the day and always use sun block. Wearing a head covering and long sleeved clothing will go a long way towards avoiding sun burn and dehydration. The water on Barbados is clean and tap water is drinkable.