Cross-boundary: mainland visitors enter Hong Kong via Shenzhen ports (Lo Wu, Futian, Shenzhen Bay and others), the Hong Kong–Zhuhai–Macao Bridge, the airport and West Kowloon high-speed rail station, with valid documents and endorsements, subject to official immigration announcement; West Kowloon station operates "co-location" clearance, so allow ample time. In town: the MTR network covers major areas of Hong Kong Island, Kowloon and the New Territories with frequent services; the Octopus card works on the MTR, buses, ferries, trams and small convenience-store purchases — a rented adult card's first purchase includes a deposit and stored value, and the card can be refunded before departure (a fee may be deducted if the card is young, subject to official announcement). Outlying islands: Central piers have ferries to Cheung Chau, Lamma Island, Mui Wo on Lantau and other places; sailings are less frequent than the metro, so check the last ferry in advance; the Star Ferry between Central and Tsim Sha Tsui costs on the order of a few Hong Kong dollars. Other options: "ding ding" trams run only along the north shore of Hong Kong Island, fares on the order of a few Hong Kong dollars; taxis come in three types — urban, New Territories and Lantau — differing in colour and service area, so confirm before boarding; both the Peak Tram and bus 15 reach the Peak, and tram queues may be long. Tickets and payment: Octopus, credit cards and mobile payments work in most situations; small shops may accept cash only or have a minimum spend; fares and fines are subject to official announcement.