General synonyms:
* Lively
* Energetic
* Spirited
* Animated
* Bustling
* Dynamic
* Thronging
* Zesty
* Vivid
* Bright
* Colorful
* Lush
More specific synonyms:
* For color: Intense, saturated, rich, brilliant
* For sound: Resounding, booming, resonant
* For feeling: Excited, enthusiastic, passionate, fervent
* For a place: Thriving, bustling, lively, flourishing
More informal synonyms:
* Zippy
* Jazzy
* Full of life
The best synonym to use will depend on the specific context and what you want to emphasize.