Helsinki has a simple and extremely efficient public transport system, rated one of the best in Europe, making it easy to hop onto trams, buses, the metro or a ferry with a single ticket purchased from the driver, ticket machines or even the HSL mobile app. Special tourist tickets are available for visitors allowing for one, three or five days' unlimited use of the public transport system. There are also plenty of taxis available to be hailed, ordered by telephone or boarded at one of the many taxi ranks. A car in the easily navigable city of Helsinki poses no problems and it is easy to drive yourself around should you so desire. There are several car hire agencies available.The city is compact and pleasant so that getting around on foot is an attractive option. Many of the most popular attractions are clumped together and can be easily navigated on foot. There are also many lovely parks to walk through. Alternatively, in summer make use of the hundreds of kilometres of bike trails by picking up a bicycle for a small coin deposit at one of the bike racks dotted around the city centre.