Hey fellow Final Fantasy X explorer! When it comes to side quests, there are some must-do ones for sure. Don’t miss out on the Celestial Weapons quests – they are super powerful and essential for end-game content. Also, make sure to complete the Monster Arena challenges to unlock some awesome rewards and tough battles. Don’t forget about the Al Bhed Primers scattered throughout Spira – collecting them all unlocks some cool secrets. And lastly, keep an eye out for the optional Aeons and Dark Aeons – they provide a good challenge and great rewards. Happy questing!