The phrase "happy as a clam" is a common expression for feeling content and satisfied. However, there are various other synonyms to use instead of this saying. Some examples are "on cloud nine", "over the moon", "elated", "ecstatic", "beaming", "delighted", "thrilled", "jubilant", "exhilarated", "joyful", "pleased as punch", "tickled pink", "blissful", "radiant", "high on life" and "in seventh heaven". Each of these phrases can convey the same level of happiness and positivity, and can be used interchangeably to express how good someone is feeling.