Yeah, but for those you'll need some auto ballasting system to keep them from capsizing.
Slightly related:
Larry Ellison Buys Lanai
In June, Oracle ORCL -0.14% co-founder Larry Ellison purchased 98% of the Hawaiian island of Lanai, valued at more than $500 million, for an undisclosed price. The sale included the two Four Seasons resorts on the island, two golf courses and more than 88,000 acres of land.
Real Estate: The Game Changers - WSJ.com
http://online.wsj.com/article/SB10001424127887324461604578189441295913754.html?mod=googlenews_wsj