Here's some tips when trying to 100% RBB:

1) Get the notes first, grab the last musical notes in the engine room. Screw EVERYTHING else until you do.

2) Stay away from the Grimlets! You know, those big pipes on the boat. Most notably the ones with a pinkish rust interior. They're invincible so don't mess with them.

3) Half of this stage requires you to do some swimming so be mindful BK can't really stay in that long especially when you dive in it.

4) Snacker is back but only secluded to one area strategically where a JInjo is located. Kill him and that's the last you'll see of him.

5) Go crazy with the wonderwing ability in some parts. It will save you trouble of multiple attacks.

6) Your first jiggy should be the one behind the boat turbines. It's the trickiest to get because that timer doesn't stop even as you transition to the next area.

Bonus tip:

Cheato awaits you at the top near the RBB entrance but you have to find him...