Yes they have a lovely area at the back of the ship which we tended to eat out for breakfast, and lunch. for dinner it was inside but I suppose you could take it outside.
Is there waiter service for dinner in the causual resturant?
Celebrity ships do not offer a buffet at dinner. They have the alternative casual 'bistro' restaurant where there is a suggested gratuity of $2pp. The menu is the same every night, but it does have specials from the main dining room too. Proper linen table cloths, napkins and waiter service. Here is the menu: Almond Nut Scallop,
Soup de Jour,
Corn Clam Chowder,
Chilled vine ripe tomato soup,
Spinach and bacon salad,
Orecchiette con funghi,
Chichen and Mac,
Griled Salmon Darne Steak,
Blackened NY Strip steak,
Entree du Jour,
Chocolate framboise and anglaise,
Galaxy has the 'old style' rear deck whereby you can get food from the self service or pizza bar & eat at the available tables. Be sharp there aren't too many though.