Walk on Water Skill card:

"Once per turn, you may cross a river or move into a water hex."

So in harsh translation - Once per turn if I'm adjecent to a water hex i can move into it OR if i'm adjecent to a river i can move to the other side of it. - without a move action!

Or

In logical translation - Once per turn if I'm in a move action i can move to the other side of the rive and i do not need to roll a water symbol OR i can move into a water hex, and i stil do not need to roll a water symbol, any kind of result is good to move into that hex.

What do you think? Which is the right way to play?

I believe it is the first but with one added bonus. It can be done during ANY part of your turn, so say you never move that turn (say adventure and rest), you can still use the Walk on Water skill once per turn.