How is moving into a hex defined? Do I move into every hex I pass on my way or only into the hex I reach at the end of my turn? If I play a double swim card: do I move in both hexes?
PS: Sorry if this has been asked before but I did not find anything about this.
When using a double swim you move into the first hex and then the second so indeed you activate the special icons in both hexes.
You also move into a hex when the current card is used if the hex your salmon is on has at least one arrow.
When jumping: you move into the hex you land on immediately, ignoring the hex (or hexes) you jumped over (except any icons in the waterfall hex itself). You do activate any icon in the hex you land on.