I'm a bit tired (from work) but not too tired to enjoy myself!
I'm a bit tired (from work) but I've still got enough energy to have fun!
「少し疲れた。でも遊びは別」= I'm a bit tired (from work) but not too tired to enjoy myself! / I'm a bit tired (from work) but I've still got enough energy to have fun!
「~は別」という短くて便利な英語がありませんので文章が長くなってしまいます!
ボキャブラリー
a bit tired = ちょっと疲れた
from work = 仕事のせいで
not too tired = 疲れすぎていない
enjoy oneself = 楽しむ(=遊ぶ事)
enough energy = じゅうぶんなエネルギー
have fun = 楽しむ(= 遊ぶ事)