These won't make you into an SAS commander but they may help avoid some difficulties as you travel around.

• Carry a card from your hostel when going out late to show the taxi/policeman where you are staying if you can't speak (German).
• Some rural places and particularly those in the south observe Siesta where the shops close between 1pm-3pm.
• Slow down, especially in rural areas. Shopkeepers are likely to spend 20mins talking to the person in front of you which is great if you are practising your German but not if you are going to catch a train.
• Padlocks on daybags. In crowds or displays keep your bag on your front and padlocked.
• Be aware on trains and the Metro for pickpockets. Keep bags padlocked and worn on your front. Be especially vigilant on crowded trains and watch out for 'fake fights' designed to distract onlookers.
• NEVER put anything remotely important in those cargo pants pockets. Pickpockets love them best.
• NEVER take your daybag with passport, credit cards, guidebook, train pass, plane tickets and $1000 Nikon camera to dinner and the pub. Take a disposable camera and as much cash as you will need. The rest can stay in the safety deposit box where you are staying.
• Ear plugs, flip flops and a sarong. The SAS agree.
• One noisy plastic bag only in your pack. This avoids someone hurling abuse and bottles at your head at 6am when you are leaving your hostel room for the airport.
• Keep an open mind!