Hey fellow Final Fantasy X explorers! When it comes to side quests, there are some hidden gems that can really enhance your gameplay experience. Make sure to look out for the Al Bhed Primers scattered throughout Spira, as collecting them unlocks the Al Bhed language, opening up new dialogue options.

Don’t forget to visit the Monster Arena in the Calm Lands. By defeating different monsters and capturing them with the fiend arena, you can earn valuable rewards and unlock some powerful abilities for your characters.

Also, keep an eye out for the Celestial Weapons and their corresponding side quests. These ultimate weapons pack a serious punch and are worth the effort to obtain. Good luck out there, and happy hunting!