Double stroller or not?

I am going away on a cruise in May with my 2.5yrs old and my baby who will be around 10 months. I have a double stroller but it's abit different as it doesn't look as bulky as a double stroller

I will see if I can find a pic of it

We took a double when we went away with 5 months and very nearly 2. She isn’t the sort of child to fall asleep in the evening in it as she enjoys what’s going on too much. We did use it for daytime naps though as we didn’t want to go back to our room. We took them both on a walk in the buggy and she napped for a hour. It was the only time she went in it.

We’ve only had to juggle two children for 7 weeks but we’re trying to avoid getting a double buggy as we’ve nowhere to store one, instead we got a second hand backpack carrier for tired legs. We also got a lascal buggy board with a seat off market place, we haven’t tried it yet as we realised it doesn’t fit with the pram fixture only the stroller but seen others using them so could be a good option as well.