Just to check if i miss anything:
There is the boat which gives points for every boat you have at the end of the game. 0-4 Boats appear in summer and you can get 0-1 boats at the end of the game.
How can someone actually score the 32 points bonus for having 5 boats?
All summer boats have to be in play, one layers has to get all of them, so he has to win 4 TILES!!! And then he has to make sure he also gets the BOAT-boat....
and he needs to place them correctly - the bonus is for connecting boats