Answer: In bold and underlined
Víctor: ¿Se lo pasó bien el pasado fin de semana? Fernando: ¡Sí! Hice el windsurf en el mar.
Translation: Víctor: Did you have a good time last weekend? Fernando: Yes! I did windsurfing in the sea.
Explanation:
The verb to "do" is that it is about doing something, this derives from the Latin that is facere.
An example, "I did an interesting job"