There are three Singapore Visitors Centres at the airport, situated in Terminals 1,2, and 3. These open from 6am until midnight. The main tourist information centre is located at the junction of Cairnhill Road and Orchard Road, and is open from 9.30am to 10.30pm daily. The nearest MRT station to the centre is Somerset (NS23). Alternatively you may call 1800 736 2000.