A valid passport is required. You may also need a tourist card (US$10 or €10) or a visa.
TOURIST CARD
Citizens of countries who are legally able to enter the European Union, Great Britain, the United States of America or Canada may enter the Dominican Republic by presenting a Tourist Card.
The Tourist Card is valid for a year from the date of purchase and is valid for an up to 30-day visit for one person who will only be able to use it once. The Tourist Card can be acquired at point of sale locations in land, air or sea ports in the country. It is also sold at Dominican embassies and consulate offices overseas and by tour operating companies. It can be purchased online at www.dgii.gov.do/tarjetaTuristica/EN/about/Paginas/default.aspx
Tourists staying beyond the usual 30-day period need to pay a proportional fee depending on the extension, which can be paid at the Department of Migration or at the migration desk upon departure.