Fun-Filled is a term used to describe a situation or experience that is imbued with amusement and entertainment. However, there are a plethora of other synonyms that can be used in its stead. Words like lively, entertaining, enjoyable, amusing, exciting, thrilling, engaging, and pleasurable are all great options. Another option could be to use idioms that describe someone or something that is happy and full of life like "full of beans," "on cloud nine," or "bubbling with joy." Using these synonyms can add a fresh and exciting twist to your writing and make it more interesting and engaging.