Formal:
* C'était agréable. (This is the most literal and neutral translation.)
* J'ai trouvé cela agréable. (This emphasizes that you found it enjoyable.)
* C'était un plaisir. (This implies a sense of pleasure and satisfaction.)
Informal:
* C'était sympa. (This is a more casual way to say it was enjoyable.)
* J'ai bien aimé. (This literally translates to "I liked it well.")
* C'était cool. (This is very informal and means "it was cool.")
More specific:
* C'était amusant. (This means "it was fun.")
* C'était intéressant. (This means "it was interesting.")
* C'était relaxant. (This means "it was relaxing.")
The best way to say "it was enjoyable" depends on the specific situation and who you are talking to.