Unfortunately, I gave up on the Bell Bearing Giant Clam section because I didn't know what to do. It wasn't that the controls were too difficult or anything like that—it was more that I genuinely had no idea what the correct action was…
The game is very beautiful, and the music and sound effects are wonderful. I felt it really captured the atmosphere of the ocean well. Maybe this part will be unlocked later, but personally, I'd be happy if it weren't just an “errands” game the whole time, and if I could freely explore and enjoy fishing and treasure hunting… Of course, this depends on personal preference, so I don't think this is the “right” answer at all.
Anyway, I had a great time. 🙂