You can also drive, ride, pedal or walk into Portugal, with major border posts open around the clock. Trains are much cheaper, but it's almost always quicker to go by bus - especially as a number of private companies operate express services between major cities and the Algarve. Note that bicycles are not permitted on trains. There are dozens of car-rental agencies in Portugal, though you should bear in mind that petrol is pricey. Bicycles can also be rented in some tourist areas.
Local transport includes trams, buses and plentiful and cheap taxis.
We encourage you to verify any critical information with the relevant authorities before you travel. This includes information on visa requirements, health and safety, customs, and transportation.