Formal:
* Jubilant: Expressing great joy or happiness.
* Elated: Feeling very happy and excited.
* Delighted: Feeling great pleasure or satisfaction.
* Exuberant: Full of energy and enthusiasm.
* Joyful: Feeling or expressing great happiness.
* Contented: Feeling satisfied and at ease.
* Blissful: Extremely happy; perfect happiness.
Informal:
* Thrilled: Extremely excited and pleased.
* Overjoyed: Extremely happy.
* Ebullient: Full of enthusiasm and high spirits.
* Ecstatic: Overwhelmed with joy or happiness.
* Enchanted: Feeling great pleasure or delight.
Other options:
* Radiant: Shining with happiness.
* Beaming: Smiling brightly with happiness.
* Affable: Friendly and easy to talk to.
* Merry: Cheerful and lighthearted.
The best choice will depend on the specific situation and the tone you want to convey.