The Dominican Republic has its own currency, called the Dominican peso.
The island is larger than most Caribbean islands, so choose carefully which airport to arrive in to avoid lengthy cab rides. Las Americas International Airport is considered the main airport and serves the southeast region, including the capital, Santo Domingo. Puerto Plata International Gregorio Luperon Airport serves the north coast area. There are other airports on the island, but they are not serviced directly by most U.S. carriers.
Requirements vary according to country, but U.S. passport holders require a Visa or Tourist Card. You may purchase one upon arrival for $10, which entitles you to a two-week stay.
The Dominican Republic is close to the equator, so doesn't have much seasonal change. It is occasionally hit by hurricanes. Hurricane season is generally August and September for this island. December through April is a popular time for U.S. visitors.
The Dominican Republic is still establishing itself. Some locals may prefer not to have their picture taken. And while haggling is a way of the local market, don't spend too much of your vacation time on this practice. Generous tourists are part of the nation's growth.