alert, brisk, lively, merry, rattling, snappy, spanking, zippy - quick and energetic
Example:- a brisk walk in the park
festal, festive, gay, merry - offering fun and gaiety
Example:- a festive (or festal) occasion
gay, jocund, jolly, jovial, merry, mirthful - full of or showing high-spirited merriment
Example:- when hearts were young and gay