Stockholm Public Transport (SL) has bus routes covering the entire island of Lidingö. It is easy to plan your trip using SL's online journey planner.
A ferry also goes from the southern part of the island to Stockholm. If you have a boat of your own, you can contact the Culture and Recreation Departmen to be put in the queue for a berth in Lidingö. Both the Bosö båtklubb and Käppala båtsällskap marinas have guest berths.
Culture and Recreation Department
Tel: 08-731 30 00
Tel: 08-766 40 10
Tel: 08-767 99 86