After you go through the toil and rigorous events of the three days in Majora's Mask to FINALLY reunite Kafei and Anju AND get the couple's mask! Very important, and very satisfying. Especially since you get to foil Sakon's (the creepy bald guy who prances around and steals stuff) plan to forever take away Kafei's wedding mask (The sun's mask). And I gotta tell you, Sakon's hideout is always nerve-racking to get through.
More satisfactory moments are yet to come, just hang tight!