Most of the Jpanese have basic knowlage of Englesh language. If you are lost, say just the key words very slowly and clearly. 
Here are some basic phrases, what I think you will need every day.

I don`t understand - Wakarimasen
Do you speak English? - Ego wakarimasuka?

Hello - Konnichiwa
Good morning - Ohayo gozaimasu
Good evening - Konbanwa
Good night - Oyasuminasai

Thank you - Arigato gozaimasu

What time is now? - Imma wa nan ji desuka?
What time is chceck in (out)? - Check in (out) wa nan ji desuka?
What time is breakfast? - Asagohan wa nan ji desuka?
What time is dinner?  - Bangohan wa nan ji desuka?
Can I have forg and nife? - Foku to Naifu kudasai.

Bus stop - Bustei
Train station - Eki
Toilet - Toire
Where is train station? - Eki wa doko desuka?
Where is some restaurant? - Restoranto wa doko desuka?
Can I have a bill? - Okaike onegaishimasu.

How much does it cost? - Kore wa ikura desuka?
Train ticket, Bus ticket - Kippu
How much is the train ticket to Tokyo? - Tokyo madeno Kippu wa ikura desuka?

Can I pay by CreditCard? - Credit Cardo wa ii desuka?
Cash - Genkin

Hot spring - Onsen
Bath - Ofuro
Ladies - Josei
Gentlmen - Dansei

I do not feel well - Kibun ga Yoku arimasen.
Please call ambulance - Kyukyusha yonde kudasai
I lost my wallet, passport, bag - Saifu, Pasuporto, Baggu naku shimashita