kjump
Doing something you like doing in real life is fun and all, but the fact remains that you can do it in real life, so why do it in video games too... <b>?</b>
Bowling, Casino, Golf, Duck Hunt, Baseball, Tecmo Bowl, Madden NFL, Sega Bass Fishing, Tony Hawk Pro Skater, Diner Dash, Pokemon Snap, Guitar Hero, Wii Sports, Just Dance, Cooking Mama...freakin Pong came from tennis. There have always been video games based on real world activities and many are very successful.
Now a ferry ride by itself may sound boring for a game, but the idea is to use it as a stage in a beat-em-up game, which could work fine.