But you can order a sandwich from room service the night before and keep it in your fridge or collapsible cooler which you will take with you (won't you?). Then go ahead ashore and enjoy. You could also not worry about it and enjoy an excellent meal ashore at one of the pubs there.
A box of small & large zip lock baggies from home. When you are going on an day
excursion, order sandwiches from room service for EARLY delivery. Then just put
them in the "baggies" and take them with you, along with fruit, etc., for snacks.