Last Part: Guybrush Kicks Butt
Saving Elaine and Kicking Butt
After landing, whatever crew you arrived with deserts you. Try to leave the docks and you'll get attacked by a ghost. Pick any choice, and you'll spray him with the magic brew of the root. Leave the docks. Spray the grim spectre with the bottle of seltzer-ness and continue to the church. Now, enter the church.
Yell whichever you feel appropriate to stop the wedding. Now, say something to LeChuck and the governor will slide down from a rope. Ask about who's in the dress and the "bride" turns out to be two monkeys with some root beer in a similar seltzer bottle. Guybrush chases them off, though, and Elaine follows them. Say what ever you want to LeChuck (though the "I can't believe your..." lines are pretty good), then he pounds you.
After you get smacked around a few more times, you land in the Grog machine at Stan's. Stan soon gets pounded and LeChuck shakes you out of the machine. Get up, then use the small green bottle of Root Beer on LeChuck. Ta-Dah!! Enjoy the ending!