One trip was me and my 2 kids, and we were in a King room so I got a rollaway for the one who was a kicker at night, and the other slept with me. My friend was a few doors down with her 4 kids (all our kids were pretty young that trip) at the Dolphin. Rooms with 2 doubles at the Dolphin can accommodate a rollaway bed, so she slept in the rollaway and said it was comfortable. Back then they didn’t charge for them, but now I see they do charge a bit extra. So if you’re at the Dolphin, you can fit a rollaway bed in the room with 2 doubles (the Swan cannot as they have queen beds and say no rollaways allowed in those rooms).
There are alcove rooms that have 2 doubles and a sofa sleeper at the Dolphin I believe (never stayed in one of those), which cost a bit more but would have more space for sure. I’d go on their website and compare all room types to see what might work.