Strongest:
* Blissful: This implies a state of perfect happiness and contentment.
* Ecstatic: This describes a state of overwhelming joy and rapture.
More general:
* Joyful: This is a more general term for happiness and cheerfulness.
* Merry: This suggests a lighthearted and carefree happiness.
* Elated: This implies a feeling of great happiness and excitement.
More metaphorical:
* Jubilant: This suggests a feeling of triumph and celebration.
* Rapturous: This implies a feeling of intense pleasure and delight.
The best term to use will depend on the specific context and the level of happiness you want to convey.