Hey there, fellow FFX explorer! When it comes to side quests, there are a few you definitely don’t want to miss.

1. **Monster Arena**: By capturing monsters and battling in the arena, you can earn great rewards and unlock some powerful abilities for your characters.

2. **Celestial Weapon Quests**: Each character has a special weapon with unique abilities. Completing their respective quests will unlock their full potential. Be prepared for some challenging battles!

3. **Al Bhed Primers**: Throughout the game, keep an eye out for Al Bhed Primers. Collecting them all will not only help you understand the Al Bhed language but also unlock some cool secrets.

4. **Blitzball**: While not exactly a side quest, Blitzball is a fun minigame that can earn you some fantastic rewards, including Wakka’s Celestial Weapon.

Make sure to explore every corner of Spira to uncover all the hidden treasures and secrets! Happy hunting!