[Miriam]

I have recently faced same situation and chose the Basic Survival, or New Basic Survival from McMillan. It is a wonderful book for basic level students with some knowledge of English. The units are short, for one class only and very practical. The focus is on communication in real everyday situations and grammar is not the main objective. You just have to see it!
For my Tourism group I chose the units that are more relevant to them:
UNIT NAME
U1 Numbers: Boarding an airplane. Finding your seat
U3 Landing Card: Filling in an arrival form and a landing card.
U4 Welcome to the United States: Going through immigration and customs control. Expressing family relationships.
U5 Baggage in Hall: Collecting baggage.
U6 A Ride Downtown: Requesting tourist information. Asking for clarification. Explaining meaning.
U7 Arriving at a Hotel: Checking into a hotel
U9 An Appointment: Making an appointment.
U10 Breakfast Buffet: Arriving in a restaurant. Selecting food from a breakfast buffet.
U12 City Guide: Location.
U13 Concierge Desk: Asking for and giving directions.
U14 Instructions: Giving instructions.
U15 Wrong Number: Making telephone calls. Asking for repetition.
U18 Itineraries: Getting information from a timetable.
U19 Visitors: Receiving visitors. Offering drinks. Introducing yourself and stating your job.
U20 Connections: Using communication devices.
U21 Fast Food: Requesting and paying for food.
U22 Gift Store: Shopping for gifts.
U24 Car Rental Inquiries: Asking for car rental information.
U25 Picking Up a Car: Picking up a rental car. Following instructions.
U26 Routines: Going over a work schedule. Extending an invitation.
U28 Lunch: Going to a business lunch.
U29 Dealing with Problems
U33 About Yourself: Talking about yourself.
U34 Getting Through: Getting through on the telephone.
U37 Polite Inquiries: Making polite inquiries.
U39 Important Messages: Collecting your messages.
U40 Telephone Service: Directory assistance and other telephone services.
U41 Attractions: Describing city attractions. Describing places / attractions.
U43 The Menu: Ordering a meal.
U44 At the Table: Receiving food orders. Restaurant etiquette.
U48 Flightseeing: Talking about vacations.
U53 Your Cabin: Being shown your room.
U54 North to Alaska: Understanding facts and figures.
U56 Computer Problems: Giving advice on computers
U60 Good-Bye: Saying good-bye. Thanking for help.

35 Units / Hours
I hope you like it!