Black screen, music:
Then the image appears and we find ourselves standing with Guybrush's parents and Chuckie. We go a little further to the right and we can see more locations similar to Booty Island, such as a ball throwing contest (instead of spitting). For some reason we have to enter the prohibited area for all people who are not part of the park workers. For that we will solve puzzles that involve interacting with Chuckie and our parents and going through "Booty Whoop". Once the objective of entering the restricted area is achieved, we take the elevator and appear in Melee.
What conflicts with my elevator idea f is that Monkey 3, which is now canon, establishes that Big Whoop is on Monkey Island, which would make getting a crew and going there like we saw in the trailers pointless. But hey, it was fun to speculate.
What I really want to happen is what I put above, that the first thing we have from the game is the music of the park and then the image appears where we left off in Monkey 2