I never actually played Mario Sunshine.

[R04] Peach At The Beach.swf (813.2 KiB) 1100x750, Compressed (Deflate). 1 frame, 34 fps (00:00). Ver15, AS3. Network access: No. Text: Yes. Bitmaps: Yes. Audio: Yes. Video: No. <METADATA> [find in archive]

I played Mario Sunshine but never got very far, because I didn't care much for the water cannon. Should emulate it and give another shot. Had completely forgotten Bowser Jr was in that game. It's when he was first introduced. Trying to think back I might have never even gotten to the reveal of him in the game.