we will be on the wonder on 3/20 . we would like to take a tour to the atlantis,but my sister has a heart problem and we don't think she can keep up with the extensive walking and climbing the stairs if we can move at a slower pace she should be fine.,can you start out with the group and proceed on your own if need be.,if not is there a better thing to do with a 10&7 year old,by the way the kids can swim but the adults can't any info would be greatly appreciated. thanks