General:
* Pleasure
* Delight
* Gratification
* Satisfaction
* Happiness
* Fun
* Amusement
* Merriment
* Jubilation
More specific:
* Exhilaration: Feeling intense excitement and happiness.
* Rapture: Feeling of intense joy and pleasure.
* Bliss: State of perfect happiness.
* Contentment: Feeling of being satisfied and at ease.
* Fulfillment: Feeling of satisfaction from achieving something.
* Ecstasy: Feeling of overwhelming happiness and excitement.
The best synonym to use will depend on the specific context of the sentence. For example, if you're talking about the enjoyment of a good meal, "satisfaction" might be a better synonym than "exhilaration."