Formal:
* C'était excitant. (This is the most straightforward translation.)
* C'était passionnant. (This emphasizes the intensity of the excitement.)
Informal:
* C'était génial! (This is a more casual way to say "it was great!")
* C'était trop cool! (This is a very informal and slangy way to say "it was really cool!")
* J'ai adoré! (This literally means "I loved it!" and expresses strong excitement.)
You can also use other expressions to describe the excitement, such as:
* C'était plein d'adrénaline. (It was full of adrenaline.)
* J'ai eu des frissons. (I got chills.)
* J'ai eu le cœur qui battait la chamade. (My heart was pounding.)
Remember to choose the most appropriate expression depending on the situation and your relationship with the person you are speaking to.