The high season in Rio runs from December through March. May through September brings thinner crowds and lower prices. Most visitors arrive at the Galeão-Antônio Carlos Jobim International Airport, which has several transfer options into the city. People of many nationalities must obtain a visa before entering Brazil. Rio is huge and thus best explored via metro, bus, and taxi. Brazilian Portuguese is spoken here, and locals appreciate a few greetings and pleasantries spoken in the native language. English menus are available at the more popular restaurants, and tips are usually included in the bill. The Brazilian real is the only currency accepted, though many businesses take credit cards.