Hi. Just been watching Grand Prix (and ironing!)
You can't prebook excursions with Thomsons, only on board.
Our itinerary is different to yours Alsacienne, we are only in Istanbul for 1 day, and only the relevant trips are in the ticket booklet. You should get one of these whoever you booked with I think. Air tickets, ship info, luggage tags all in one booklet.
We are not sure what to do ourselves in Istanbul. Would like to see some of the Asian side, and the spice market, and possibly a bit of the modern area. The destination services people were really helpful and knowledgeable last year so hope the same person is on board this year. They had port talks on board, separate from excursion showcase, gave lots of good tips for DIY. Definitely need to take paper and pen to that. Oh, and always get a map marked with ship's berth if possible, and always take the Daily Newsletter out with you as it has important contact details in case of emergencies.
A really hectic week at work ahead, then I can begin my countdown!!
kate