There is a nice, juices-flowing, endorphins kind-of feeling, you get from just the right amount of exercise.
Going from this, to slow-down mode made my heart flip-flop, for just a few minutes.
I think I would be safe, cooking or BBQ'ing a little on kava (not a whole banquet or holiday dinner.) I don't consider it hard, but still, definitely a drug, in active doses, I wouldn't risk powertools and driving.
Like a low to medium dose of sleeping pills, depending on your tolerances. I have a hard time saying what is appropriate, for others, because I'm sturdy.