Our DS3.5 still likes the stroller for long walks and we forgot to take ours onboard. I really missed it at St Marteen while dh did the regatta, as I walked round town with ds and did the beach, I could of shopped better and longer if he had it lol. Also at CCay as it is a long walk to get from the tram to less crowded beach areas, but we did see strollers to borrow next to the wheelchairs.
I think you should take an umbrella stroller with you and then you have the choice, you can store it in the wardrobe or under the bed easily and no bother.