There is a 24 hour buffet and if you like you can eat all your meals there. If you would like more formal dining i.e. waiter service in the dining room this is also available and they are just asking if you would prefer to eat at 6.30 ish or 8.30ish. there is usually one formal evening per week on Thomson cruises the rest of the time it is smart casual i.e. shirt and trousers but not necessarily a tie and jacket in the main restaurant. The shows are usually 8.30 ish and 10.30ish so whichever dinner you choose you can still see the show. Hope this helps a bit!
We have been on the Destiny several times and we have always booked 2nd sitting, the reason being is that you get longer in the sunshine. You can eat in the lido bar as this is open all day but it is much better in the restaurant. the weaiters are fab and really look after yo.
24 hour restaurant is on deck and can be very cold, the seven seas restaurant buffet breakfast waiter sevice lunch and dinner and in doors you need it at this time of year. I know just got back only one day of sun and very windy only managed on morning on deck.