Visitors to São Paulo will most likely land at Guarulhos International Airport. Located 25 kilometers from the city center, shuttle busses, taxies, and train services operate convenient ways to get to the city center. Visitors may want to consider the Bilhete Único smart card which can be used to pay for fares on busses, subways, and trains. Although crime in São Paulo has dropped significantly in recent years, visitors should still take precautions and avoid traveling alone at night. Certain neighborhoods should be avoided, and if unsure, visitors are advised to check with their hotel. The city offers tourist police stations in several districts and the airport who can assist if needed.