In addition to the standard basic courtesy and greeting expressions - which phrases would you suggest travelers to Germany be familiar with?

(BavariaBen) ...You don't necessarily have to know the language to be able to survive in Germany. Many Germans - especially the younger generations - are familiar enough with English that you can usually get by without much difficulty. You should however familiarize yourself with as many basic phrases as possible so as to make your travel experiences more rewarding and complete. Many of us frequent travelers to Germany are not fluent in the language but we have learned enough German to be able to 'get by' comfortably. A few of my most used expressions -

Ich habe mich verirrt - (I'm lost)
Können Sie mir helfen? - (Can you help me?)
Wo ist... die Toilette? - (Where is... the toilet?)
Noch ein Bier bitte - (Another beer please!)
Sprechen Sie langsam, bitte - (Speak slowly please)
Ich verstehe nicht - (I don't understand)

(Capitals321) - Learn your numbers and you will have an easier time with purchases and schedules. The following are a few of the expressions I find myself using often -

Ich sehe mich nur um - (I'm just looking around)
Haben Sie nichts Billigeres? - (Don't you have anything cheaper?)
Wieviel kostet das? - (How much does this cost?)
Ich nehme es - (I'll take it)
Können Sie mir ein gutes Restaurant empfehlen? - (Can you recommend a good restaurant?)
Das Essen war sehr gut - (The meal was very good)

(JRLVR1) ...Two important words -

Einbahnstraße - (One-way street)
Fußgängerzone - (Pedestrians only zone)

(FürstenbergFred) - Some of my most used phrases... :o) -

Ein Bier vom Faß bitte - (A draft beer please..)
Ich habe zuviel gesoffen - (I drank too much!)
Meine Birne dröhnt immer noch - (My head is still ringing...)

(Rolfoe) -

Umleitung - (Detour)
Zahlen bitte or Rechnung bitte - (Check please)
Leitungswasser bitte - (Tap-Water please)

(OneKid4Me) -

Was ist das auf Deutsch? - (What is this in German?)
I am always wanting to know what something is called, especially at a restaurant
Grüß Gott! - (Hello greeting - Southern Germany & Austria)
Guten Morgen - (Good morning)
Guten Tag - (Good afternoon)
Guten Abend - (Good evening)
Auf Wiedersehen - (Good-bye)
Tschüss - (Informal Good-bye)
All typical phrases one should use upon entering and leaving any establishment - I have found that most owners will greet you when you enter - You should be polite and greet them also - and say good-bye.
Sprechen Sie Englisch? - (Do you speak English?)
Ich Spreche ein wenig Deutsch - (I speak a little German)
Vielen Dank - (Thank you very much!)