Ao Por, located on North East corner of Phuket, is a good place for boat spotting. Often very large vessels visit the Ao Por Grand marina. Some of those look particularry interesting.
6711 This is a service boat, to hold toys for the primary yach.
Three masted ship
Boats at Ao Por Grand marina
Subsea cable laying ship
Planet Solar - solar powered catamaran visited Ao Por in 2011. Couple more photos http://aopor.com/news/world-biggest-solar-ship-ao-po-grand-marina
Not all boats are huge, it's the attitude what matters :)