The Sims 3: Island Paradise. Unlike normal homes, they have the ability to move on water. They are built on docks, using a unique type of platform and then can leave the dock. Sims can leave the boat to go diving or on a smaller type of boat. When services, such as a repairman are needed, the hired Sims will come on boats. Houseboats require controls to be able to move in water, and are much smaller than normal houses.