You are a monarch, like your parents before you, a ruler of a small pleasant kingdom of rivers and evergreens. Unlike your parents, however, you have hopes and dreams! You want a bigger and more pleasant kingdom, with more rivers and a wider variety of trees. You want a Dominion! You will bring civilization to these people, uniting them under your banner.
Now, all you ask is a tall ship and a star to steer her by. And someone who knows how to steer ships using stars. You finally got some of those rivers you'd wanted, and they led to the sea. These are dangerous, pirate-infested waters, and you cautiously send rat-infested ships across them, to establish lucrative trade at far-off merchant-infested ports.
First, you will take over some islands, as a foothold. The natives seem friendly enough, crying their peace cries, and giving you spears and poison darts before you are even close enough to accept them properly.
When you finally reach those ports you will conquer them, and from there you will look for more rivers.
One day, all the rivers will be yours.
Dominion Seaside Expansion is an expansion for Dominion, and must be played with either Dominion or Dominion Intrigue (or both), and cannot be played on its own.