General:
* Entertaining (most common and straightforward)
* Amusing
* Engaging
* Pleasing
* Enjoyable
Specific types of entertainment:
* Thrilling (for action movies, roller coasters)
* Hilarious (for comedy)
* Moving (for emotional films, plays)
* Educational (for documentaries, museum exhibits)
* Inspiring (for motivational speeches, art)
* Relaxing (for music, spa treatments)
Other possibilities:
* Diverting
* Stimulating
* Invigorating
* Exhilarating
* Captivating
Ultimately, the best adjective to use depends on what kind of entertainment you want to describe and the specific effect you want to convey.