Germany
Buy the welcome card - you can purchase it in advance (and pay a hefty shipping fee) or buy it at the airport at Gate 13. It provides 50% off of attractions and free subway transportation for the time period that you select.
Don't hesitate to try the bus system or subway. Both are inexpensive, intuitive, quick, and user-friendly.
Full report at www.travelmusings.net
Visitor card: www.visitberlin.de/welcomecard/index.php?lang=en
Public transportation instructions/tips: wikitravel.org/en/Berlin
Search Been there