Last year I went out for a night of drinking and fun (or so I thought) to celebrate my friend’s 18^th birthday.

a. “fun” has the meaning I intended for it to have in this writing piece but perhaps it is too basic or broad

2. a. lively, dynamic, wild, chipper, spirited

Last year I went out of a spirited/wild night of drinking (or so I thought) to celebrate my friend’s 18th birthday