Hey fellow Final Fantasy X explorer! When it comes to side quests, there are a few must-dos in the game. Make sure to complete the monster arena challenges to unlock some powerful items and abilities. Additionally, don’t forget to search for the Al Bhed primers scattered throughout Spira to unlock the Al Bhed language, which can be super helpful. Lastly, don’t miss out on the optional Aeons like Yojimbo and Anima by completing their respective side quest chains. Happy adventuring!