I would say sushi, but I tend to eat too much of it and then all I want to do is lay around feeling happy

So I will say.. an assortment of fresh fruit.

Sushi for happiness and fruit for fun times  

To make it really hot, I suggest timeless ideas from Rude Food, by David Thorpe

Keep it light

I agree, Sushi is sexy and so is fruit. You don't want to get bogged down eating anything heavy, especially since you'll be participating in "extracurricular activity" later on the date