ArenaNet:Guild Wars 2 suggestions/races better built for water travel but still able to come onto land

Races better built for water travel but still able to come onto land (Discussion)
Give us a race that can travel the water easily and doesnt haft to worry about their breath at all or just a little and can still travel the land
 * Why this is a good idea
 * It allows underwater cities extremly deep down in the water to be built
 * we can still travel the land (maybe give a disadvantage on land to even it out?)


 * Why it may not work out
 * Underwater its a huge disadvantage to other races