
Singapore is a gateway to Indonesia, amongst other neighbouring countries. There are regular ferries every day between the World Trade Centre and Batam and Bintain, both about 30 minutes away. These two islands make up part of the Riau Archipeligo and from Sekupang on Batam Island you can enter Indonesia immigration, change money and then do the best thing you can, and that is get a ferry straight out. To Pekanbaru on Sumatra " a long but excellent days travelling by decrepit ferry and unroadworthy bus " is a good option. Thus you can travel from Singapore to central Sumatra very cheaply in one day.