ecstatic, euphoric, thrilled, overjoyed, elated, delighted, on cloud nine/seven, walking/treading on air, in seventh heaven, jubilant, rapturous, beside oneself with joy, jumping for joy, exultant, transported, delirious, enraptured, blissful, in raptures, as pleased as Punch, cock-a-hoop, as happy as a sandboy, as happy as Larry, like a child with a new toy

informal on top of the world, on a high, tickled pink

Northern English informal made up

North American informal as happy as a clam

Australian informal wrapped