Similar in meaning:
* Eager
* Excited
* Passionate
* Ardent
* Fervent
* Zealous
* Rapturous
* Spirited
* Animated
* Vivacious
More specific synonyms:
* Buoyed: Feeling hopeful and optimistic.
* Riveted: Completely focused and absorbed.
* Fired up: Full of energy and determination.
* Invested: Having a strong personal interest.
* Inspired: Motivated and filled with creative ideas.
* Engrossed: Completely involved and absorbed.
* Intrigued: Curious and interested.
The best synonym to use will depend on the specific context and the nuance you want to convey.