Managed to get an information booklet on the Oasis, last time we went over. List of services / shops is quite extensive and don't know if they'll all still go ahead in the current financial climate but here's the list anyway.
Residential services - Polaris
Reception, Polaris security & call centre, Polaris real estates, First aid centre, Nursery, Religious services
Leisure - Restraurants, Bars, Food court, Cafeteria, Ice cream bars, Deli, Mini casino, Bingo, Disco, Civi & cultural centre, Social club, Festival market, Bike Hire,Video games
Water Palace - Wellness centre, Spa, Gym, Haidresser, Baths area, Chiqui Parks-kids indoor play area, Water games
Shopping Area - Clothes shops, Household equipment, Shoe shops, Accessories, Sports shops, Gift & Souvenirs shop, Travel equipment, Toy shop, Dry cleaners, DIY store, Jewellery shop, Optician, Florist
Cultural Audiovisual - Bookshop, Music & electronic equipment, Internet, Mobile phone shop, Arts and crafts, Photo shop, Newsagent
Health and Beauty - Pharmacy, Perfume shop, Health Food,
Food - Supermarkets, Butchers, Greengrocer, Fruit shop, Off Licence, Tobacconist
Offices & Other services - Banks, Cash Points, Munisipal services, Insurance broker, Solicitor, Travel agent, Pet shop, Vets surgery, Post office, car hire, car park
Hope this helps.